United States Senate elections, 2018
33 of the 100 seats (Class 1) in the United States Senate
(and 2 special elections)
51 seats needed for a majority
as of 11:10 (UTC-5)
Results of the general and special elections
Democratic gain Republican gain
Democratic hold Republican hold
Independent hold Undetermined
Line through state means both seats are up for election.
The elections to the United States Senate were held on November 6, 2018. 33 of the 100 seats were contested in regular elections and two seats in special elections. The winners of the 33 regular elections will serve six-year terms from January 3, 2019, to January 3, 2025. Democrats had 26 seats up for election, including the seats of two independents who caucus with them. Republicans had nine seats up for election. The seats up for regular election in 2018 were last up in 2012; in addition, special elections were scheduled due to vacancies in Minnesota and Mississippi.
Republicans could only afford to have a net loss of one Senate seat to maintain their working majority of 50 Senators and Republican Vice President Mike Pence, who is able to cast a tie-breaking vote in accordance with Article One of the United States Constitution. Three of the Republican seats were open as a result of retirements in Tennessee, Utah, and Arizona. Democrats were defending ten seats in states won by Donald Trump in the 2016 presidential election, while Republicans were only defending one seat in a state won by Hillary Clinton in 2016. According to FiveThirtyEight, Democrats faced the most unfavorable Senate map in 2018 that any party has ever faced in any election.
Although the final tally is yet to be confirmed, the Republicans kept the Senate majority, defeating three Democratic incumbents in Indiana, Missouri, and North Dakota. This is the first midterm election cycle since 2002 where any incumbents of the non-presidential party lost re-election. Democrats defeated one Republican incumbent in Nevada and flipped one seat in Arizona in which the incumbent retired. Out of the 33 determined winners, 22 are Democrats, nine are Republicans, and two are independents who caucus with the Democrats. The winner in Florida, as well as one state with a runoff election (Mississippi), has yet to be determined.
- 1 Focus on competitive races
- 2 Partisan composition
- 3 Change in composition
- 4 Pre-election predictions
- 5 Election dates
- 6 Race summary
- 7 Arizona
- 8 California
- 9 Connecticut
- 10 Delaware
- 11 Florida
- 12 Hawaii
- 13 Indiana
- 14 Maine
- 15 Maryland
- 16 Massachusetts
- 17 Michigan
- 18 Minnesota
- 19 Minnesota (Special)
- 20 Mississippi
- 21 Mississippi (Special)
- 22 Missouri
- 23 Montana
- 24 Nebraska
- 25 Nevada
- 26 New Jersey
- 27 New Mexico
- 28 New York
- 29 North Dakota
- 30 Ohio
- 31 Pennsylvania
- 32 Rhode Island
- 33 Tennessee
- 34 Texas
- 35 Utah
- 36 Vermont
- 37 Virginia
- 38 Washington
- 39 West Virginia
- 40 Wisconsin
- 41 Wyoming
- 42 National results
- 43 See also
- 44 Notes
- 45 References
Focus on competitive races
Democrats targeted Republican-held Senate seats in Arizona (open seat) and Nevada. Seats in Texas, Mississippi (at least one of the two seats) and Tennessee (open seat) were also competitive for the Democrats. Republicans targeted Democratic-held seats in Indiana, Missouri, Montana, North Dakota, and West Virginia, all of which voted for Mitt Romney in the 2012 presidential election and Donald Trump in the 2016 presidential election. Seats in Florida, Ohio, Pennsylvania, Wisconsin, and Michigan, all of which voted for Donald Trump in the 2016 election, were also targeted by Republicans.
Among the 33 Class 1 Senate seats up for regular election in 2018 are 23 currently held by Democrats, two by independents who caucus with the Senate Democrats, and eight by Republicans. The Class 2 seats in Minnesota and Mississippi held by interim appointees are also up for election; both incumbent appointees are running in their elections to finish the unexpired terms.
|Last election (2016)||46||52||2||100|
|Before this election||47||51||2||100|
|Class 2 (2014→2020)||11||20||0||31|
|Class 3 (2016→2022)||12||22||0||34|
|Class 1 (2012→2018)||23||8||2||33|
|Special: Class 2||1||1||0||2|
Change in composition
Each block represents one of the one hundred seats in the U.S. Senate. "D#" is a Democratic senator, "I#" is an Independent senator, and "R#" is a Republican senator. They are arranged so that the parties are separated and a majority is clear by crossing the middle.
Before the elections
Each block indicates an incumbent senator's actions going into the election: Some "Ran" for re-election, some "Retired," and the remainder (without a note) were not up for election this year. Before the elections, Democrats had 47 seats, Independents 2, and Republicans had a 51-seat majority.
After the elections
Each block indicates the results of each election: Some senators were "Re-elected," some were a "Gain" in the seat from the other party (either by beating an incumbent or by winning an open seat), some were a "Hold" by the same party but with a different senator, one was an "Appointee elected" to finish a term, and the remainder (without a note) were not up for election this year. After the elections, Democrats had at least 45 seats, Independents 2, and Republicans had at least a 51-seat majority.
Most election predictors use:
- "tossup": no advantage
- "tilt" (used sometimes): advantage that is not quite as strong as "lean"
- "lean": slight advantage
- "likely" or "favored": significant, but surmountable, advantage (highest ranking given from Fox News)
- "safe" or "solid": near-certain chance of victory
|Arizona||R+5||Jeff Flake (R)|
|49% R||Tossup||Tilt D (flip)||Lean D (flip)||Tossup||Tossup||Tossup||Tossup||Tossup||Tossup||Lean D (flip)||Sinema (D)|
|California||D+12||Dianne Feinstein (D)||63% D||Safe D||Safe D||Safe D||Safe D||Safe D||Safe D||Likely D||Safe D||Safe D||Safe D||Feinstein (D)|
|Connecticut||D+6||Chris Murphy (D)||55% D||Safe D||Safe D||Safe D||Safe D||Safe D||Safe D||Likely D||Safe D||Safe D||Safe D||Murphy (D)|
|Delaware||D+6||Tom Carper (D)||66% D||Safe D||Safe D||Safe D||Safe D||Safe D||Safe D||Likely D||Safe D||Safe D||Safe D||Carper (D)|
|Florida||R+2||Bill Nelson (D)||55% D||Tossup||Tilt D||Lean D||Tossup||Tossup||Tossup||Tossup||Tossup||Tossup||Lean D||TBD|
|Hawaii||D+18||Mazie Hirono (D)||63% D||Safe D||Safe D||Safe D||Safe D||Safe D||Safe D||Likely D||Safe D||Safe D||Safe D||Hirono (D)|
|Indiana||R+9||Joe Donnelly (D)||50% D||Tossup||Tossup||Lean R (flip)||Tossup||Tossup||Tossup||Tossup||Tossup||Tossup||Lean D||Braun (R)|
|Maine||D+3||Angus King (I)||53% I||Safe D/I||Safe D/I||Safe D/I||Safe D/I||Safe D/I||Safe D/I||Likely D/I||Safe D/I||Safe D/I||Safe D/I||King (I)|
|Maryland||D+12||Ben Cardin (D)||55% D||Safe D||Safe D||Safe D||Safe D||Safe D||Safe D||Likely D||Safe D||Safe D||Safe D||Cardin (D)|
|Massachusetts||D+12||Elizabeth Warren (D)||54% D||Safe D||Safe D||Safe D||Safe D||Safe D||Safe D||Likely D||Safe D||Safe D||Safe D||Warren (D)|
|Michigan||D+1||Debbie Stabenow (D)||59% D||Likely D||Safe D||Safe D||Likely D||Likely D||Lean D||Likely D||Safe D||Likely D||Safe D||Stabenow (D)|
|Minnesota||D+1||Amy Klobuchar (D)||65% D||Safe D||Safe D||Safe D||Safe D||Safe D||Safe D||Likely D||Safe D||Safe D||Safe D||Klobuchar (D)|
|D+1||Tina Smith (D)||53% D||Lean D||Likely D||Likely D||Lean D||Likely D||Lean D||Likely D||Likely D||Likely D||Likely D||Smith (D)|
|Mississippi||R+9||Roger Wicker (R)||57% R||Safe R||Safe R||Safe R||Safe R||Safe R||Safe R||Likely R||Safe R||Safe R||Safe R||Wicker (R)|
|R+9||Cindy Hyde-Smith (R)||60% R||Lean R||Safe R||Likely R||Lean R||Safe R||Likely R||Lean R||Likely R||Likely R||Lean R||TBD|
|Missouri||R+9||Claire McCaskill (D)||55% D||Tossup||Tilt R (flip)||Lean R (flip)||Tossup||Tossup||Tossup||Tossup||Tossup||Tossup||Tossup||Hawley (R)|
|Montana||R+11||Jon Tester (D)||49% D||Tossup||Tilt D||Lean D||Tossup||Lean D||Tossup||Lean D||Tossup||Lean D||Likely D||Tester (D)|
|Nebraska||R+14||Deb Fischer (R)||56% R||Safe R||Safe R||Safe R||Safe R||Safe R||Safe R||Likely R||Safe R||Safe R||Safe R||Fischer (R)|
|Nevada||D+1||Dean Heller (R)||46% R||Tossup||Tilt D (flip)||Lean D (flip)||Tossup||Tossup||Tossup||Tossup||Tossup||Tossup||Tossup||Rosen (D)|
|New Jersey||D+7||Bob Menendez (D)||59% D||Tossup||Likely D||Likely D||Tossup||Lean D||Lean D||Lean D||Lean D||Lean D||Likely D||Menendez (D)|
|New Mexico||D+3||Martin Heinrich (D)||51% D||Safe D||Safe D||Safe D||Safe D||Safe D||Safe D||Likely D||Safe D||Safe D||Safe D||Heinrich (D)|
|New York||D+11||Kirsten Gillibrand (D)||72% D||Safe D||Safe D||Safe D||Safe D||Safe D||Safe D||Likely D||Safe D||Safe D||Safe D||Gillibrand (D)|
|North Dakota||R+16||Heidi Heitkamp (D)||50% D||Lean R (flip)||Lean R (flip)||Lean R (flip)||Lean R (flip)||Lean R (flip)||Lean R (flip)||Likely R (flip)||Lean R (flip)||Lean R (flip)||Lean R (flip)||Cramer (R)|
|Ohio||R+3||Sherrod Brown (D)||51% D||Likely D||Safe D||Likely D||Likely D||Likely D||Lean D||Likely D||Likely D||Likely D||Safe D||Brown (D)|
|Pennsylvania||EVEN||Bob Casey Jr. (D)||54% D||Likely D||Safe D||Safe D||Likely D||Likely D||Likely D||Likely D||Safe D||Likely D||Safe D||Casey (D)|
|Rhode Island||D+10||Sheldon Whitehouse (D)||64% D||Safe D||Safe D||Safe D||Safe D||Safe D||Safe D||Likely D||Safe D||Safe D||Safe D||Whitehouse (D)|
|Tennessee||R+14||Bob Corker (R)|
|65% R||Tossup||Lean R||Lean R||Tossup||Tossup||Tossup||Lean R||Lean R||Lean R||Likely R||Blackburn (R)|
|Texas||R+8||Ted Cruz (R)||57% R||Tossup||Likely R||Lean R||Tossup||Lean R||Lean R||Lean R||Lean R||Lean R||Likely R||Cruz (R)|
|Utah||R+20||Orrin Hatch (R)|
|65% R||Safe R||Safe R||Safe R||Safe R||Safe R||Safe R||Likely R||Safe R||Safe R||Safe R||Romney (R)|
|Vermont||D+15||Bernie Sanders (I)||71% I||Safe D/I||Safe D/I||Safe D/I||Safe D/I||Safe D/I||Safe D/I||Likely D/I||Safe D/I||Safe D/I||Safe D/I||Sanders (I)|
|Virginia||D+1||Tim Kaine (D)||53% D||Safe D||Safe D||Safe D||Safe D||Safe D||Safe D||Likely D||Safe D||Safe D||Safe D||Kaine (D)|
|Washington||D+7||Maria Cantwell (D)||61% D||Safe D||Safe D||Safe D||Safe D||Safe D||Safe D||Likely D||Safe D||Safe D||Safe D||Cantwell (D)|
|West Virginia||R+20||Joe Manchin (D)||61% D||Lean D||Tilt D||Lean D||Lean D||Lean D||Tossup||Lean D||Lean D||Lean D||Likely D||Manchin (D)|
|Wisconsin||EVEN||Tammy Baldwin (D)||51% D||Likely D||Safe D||Likely D||Likely D||Likely D||Lean D||Likely D||Likely D||Likely D||Safe D||Baldwin (D)|
|Wyoming||R+25||John Barrasso (R)||76% R||Safe R||Safe R||Safe R||Safe R||Safe R||Safe R||Likely R||Safe R||Safe R||Safe R||Barrasso (R)|
For the regularly scheduled general elections. Shading added for future events.
|Arizona||May 30, 2018||August 28, 2018||N/A||November 6, 2018||9pm|
|California||March 9, 2018||June 5, 2018||N/A||November 6, 2018||11pm|
|Connecticut||June 12, 2018||August 14, 2018||N/A||November 6, 2018||8pm|
|Delaware||July 10, 2018||September 6, 2018||N/A||November 6, 2018||8pm|
|Florida||May 4, 2018||August 28, 2018||N/A||November 6, 2018||7pm & 8pm|
|Hawaii||June 5, 2018||August 11, 2018||N/A||November 6, 2018||11pm|
|Indiana||February 9, 2018||May 8, 2018||N/A||November 6, 2018||6pm & 7pm|
|Maine||March 15, 2018||June 12, 2018||N/A||November 6, 2018||8pm|
|Maryland||February 27, 2018||June 26, 2018||N/A||November 6, 2018||8pm|
|Massachusetts||June 5, 2018||September 4, 2018||N/A||November 6, 2018||8pm|
|Michigan||April 24, 2018||August 7, 2018||N/A||November 6, 2018||8pm & 9pm|
|Minnesota||June 5, 2018||August 14, 2018||N/A||November 6, 2018||9pm|
|Mississippi||March 1, 2018||June 5, 2018||June 26, 2018||November 6, 2018||8pm|
|Mississippi (Special)||March 26, 2018||November 6, 2018||N/A||November 27, 2018[d]||8pm|
|Missouri||March 27, 2018||August 7, 2018||N/A||November 6, 2018||8pm|
|Montana||March 12, 2018||June 5, 2018||N/A||November 6, 2018||10pm|
|Nebraska||March 1, 2018||May 15, 2018||N/A||November 6, 2018||9pm|
|Nevada||March 16, 2018||June 12, 2018||N/A||November 6, 2018||10pm|
|New Jersey||April 2, 2018||June 5, 2018||N/A||November 6, 2018||8pm|
|New Mexico||March 13, 2018||June 5, 2018||N/A||November 6, 2018||9pm|
|New York||April 12, 2018||June 26, 2018||N/A||November 6, 2018||9pm|
|North Dakota||April 9, 2018||June 12, 2018||N/A||November 6, 2018||10pm & 11pm|
|Ohio||February 7, 2018||May 8, 2018||N/A||November 6, 2018||7:30pm|
|Pennsylvania||March 20, 2018||May 15, 2018||N/A||November 6, 2018||8pm|
|Rhode Island||June 27, 2018||September 12, 2018||N/A||November 6, 2018||8pm|
|Tennessee||April 5, 2018||August 2, 2018||N/A||November 6, 2018||8pm|
|Texas||December 11, 2017||March 6, 2018||May 22, 2018|
|November 6, 2018||8pm & 9pm|
|Utah||March 15, 2018||June 26, 2018||N/A||November 6, 2018||10pm|
|Vermont||May 31, 2018||August 14, 2018||N/A||November 6, 2018||7pm|
|Virginia||March 29, 2018||June 12, 2018||N/A||November 6, 2018||7pm|
|Washington||May 18, 2018||August 7, 2018||N/A||November 6, 2018||11pm|
|West Virginia||January 27, 2018||May 8, 2018||N/A||November 6, 2018||7:30pm|
|Wisconsin||June 1, 2018||August 14, 2018||N/A||November 6, 2018||9pm|
|Wyoming||June 1, 2018||August 21, 2018||N/A||November 6, 2018||9pm|
Special elections during the preceding Congress
In these special elections, the winners will be seated before January 3, 2019, when elected and qualified. Ordered by election date, then by state, then by class.
|Tina Smith||Democratic||2018 (Appointed)||Interim appointee elected November 6, 2018.||√ Tina Smith (Democratic) 53.6%|
Karin Housley (Republican) 41.8
Sarah Wellington (Legal Marijuana Now) 3.7%
Jerry Trooien (Independent) 0.9%
|Cindy Hyde-Smith||Republican||2018 (Appointed)||Interim appointee nominated.|
Runoff election to be held November 27, 2018.
|Mike Espy (Democratic)|
Cindy Hyde-Smith (Republican)
Elections leading to the next Congress
In these general elections, the winners were elected for the term beginning January 3, 2019.
All of the elections involve the Class 1 seats; ordered by state.
|Arizona||Jeff Flake||Republican||2012||Incumbent retired|
New senator elected.
|√ Kyrsten Sinema (Democratic) 49.68%|
Martha McSally (Republican) 47.96%
Angela Green (Green) 2.37%
|California||Dianne Feinstein||Democratic||1992 (Special)|
|Incumbent re-elected.||√ Dianne Feinstein (Democratic) 53.8%|
Kevin de León (Democratic) 46.2%
|Connecticut||Chris Murphy||Democratic||2012||Incumbent re-elected.||√ Chris Murphy (Democratic) 58.4%|
Matthew Corey (Republican) 40.5%
Richard Lion (Libertarian) 0.6%
Jeff Russell (Green) 0.5%
|Incumbent re-elected.||√ Tom Carper (Democratic) 60%|
Robert Arlett (Republican) 37.8%
Demitri Theodoropoulos (Green) 1.2%
Nadine Frost (Libertarian) 1.1%
Final results pending
|Bill Nelson (Democratic)|
Rick Scott (Republican)
|Hawaii||Mazie Hirono||Democratic||2012||Incumbent re-elected.||√ Mazie Hirono (Democratic) 72.7%|
Ron Curtis (Republican) 27.3%
|Indiana||Joe Donnelly||Democratic||2012||Incumbent lost re-election.|
New senator elected.
|√ Mike Braun (Republican) 52.9%|
Joe Donnelly (Democratic) 43.1%
Lucy Brenton (Libertarian) 4.0%
|Maine||Angus King||Independent||2012||Incumbent re-elected.||√ Angus King (Independent) 54.2%|
Eric Brakey (Republican) 35.6%
Zak Ringelstein (Democratic) 10.2%
|Incumbent re-elected.||√ Ben Cardin (Democratic) 64.2%|
Tony Campbell (Republican) 31.1%
Neal Simon (Independent) 3.7%
Arvin Vohra (Libertarian) 1%
Michael Puskar (Independent) (write-in)
|Massachusetts||Elizabeth Warren||Democratic||2012||Incumbent re-elected.||√ Elizabeth Warren (Democratic) 60.5%|
Geoff Diehl (Republican) 36.2
Shiva Ayyadurai (Independent) 3.4%
|Incumbent re-elected.||√ Debbie Stabenow (Democratic) 51.8%|
John James (Republican) 46.1%
Marcia Squier (Independent) 1%
George Huffman III (Taxpayers) 0.7
John Wilhelm (Natural Law) 0.4%
|Incumbent re-elected.||√ Amy Klobuchar (Democratic) 60.9%|
Jim Newberger (Republican) 35.7%
Dennis Schuller (Legal Marijuana Now) 2.5%
Paula M. Overby (Green) 0.9%
|Mississippi||Roger Wicker||Republican||2007 (Appointed)|
|Incumbent re-elected.||√ Roger Wicker (Republican) 58.9%|
David Baria (Democratic) 39.1%
Danny Bedwell (Libertarian) 1.4%
Shawn O'Hara (Reform) 0.6%
|Incumbent lost re-election.|
New senator elected.
|√ Josh Hawley (Republican) 51.9%|
Claire McCaskill (Democratic) 45.1%
Craig O'Dear (Independent) 1.4%
Japheth Campbell (Libertarian) 1.2%
Jo Crain (Green) 0.6%
|Incumbent re-elected.||√ Jon Tester (Democratic) 49.8%|
Matthew Rosendale (Republican) 47.3%
Rick Breckenridge (Libertarian) 2.9%
|Nebraska||Deb Fischer||Republican||2012||Incumbent re-elected.||√ Deb Fischer (Republican) 58%|
Jane Raybould (Democratic) 38.4%
Jim Schultz (Libertarian) 3.6%
|Nevada||Dean Heller||Republican||2011 (Appointed)|
|Incumbent lost re-election.|
New senator elected.
|√ Jacky Rosen (Democratic) 51.5%|
Dean Heller (Republican) 44.3%
None of these candidates 1.6%
Barry Michaels (Independent) 1%
Tim Hagan (Libertarian) 0.9%
Kamau Bakari (Independent American) 0.7%
|New Jersey||Bob Menendez||Democratic||2006 (Appointed)|
|Incumbent re-elected.||√ Bob Menendez (Democratic) 53.1%|
Bob Hugin (Republican) 43.7%
Madelyn Hoffman (Green) 0.8%
Murray Sabrin (Libertarian) 0.7
Natalie Rivera (For The People) 0.6%
Tricia Flanagan (New Day NJ) 0.5%
Kevin Kimple (Make It Simple) 0.3%
Hank Schroeder (Economic Growth) 0.3%
|New Mexico||Martin Heinrich||Democratic||2012||Incumbent re-elected.||√ Martin Heinrich (Democratic) 53.7%|
Mick Rich (Republican) 30.8%
Gary Johnson (Libertarian) 15.4%
|New York||Kirsten Gillibrand||Democratic||2009 (Appointed)|
|Incumbent re-elected.||√ Kirsten Gillibrand (Democratic) 66.6%|
Chele Chiavacci Farley (Republican) 33.4%
|North Dakota||Heidi Heitkamp||Democratic||2012||Incumbent lost re-election.|
New senator elected.
|√ Kevin Cramer (Republican) 55.4%|
Heidi Heitkamp (Democratic) 44.6%
|Incumbent re-elected.||√ Sherrod Brown (Democratic) 53.2%|
Jim Renacci (Republican) 46.8%
|Pennsylvania||Bob Casey Jr.||Democratic||2006|
|Incumbent re-elected.||√ Bob Casey Jr. (Democratic) 55.6%|
Lou Barletta (Republican) 42.8%
Dale Kerns (Libertarian) 1%
Neal Gale (Green) 0.6%
|Rhode Island||Sheldon Whitehouse||Democratic||2006|
|Incumbent re-elected.||√ Sheldon Whitehouse (Democratic) 61.5%|
Robert Flanders (Republican) 38.5%
New senator elected.
|√ Marsha Blackburn (Republican) 54.4%|
Phil Bredesen (Democratic) 44.2%
Trudy Austin (Independent) 0.4%
Dean Hill (Independent) 0.4%
Kris Todd (Independent) 0.2%
John Carico (Independent) 0.2%
Breton Phillips (Independent) 0.1%
Kevin McCants (Independent) 0.1%
|Texas||Ted Cruz||Republican||2012||Incumbent re-elected.||√ Ted Cruz (Republican) 51.1%|
Beto O'Rourke (Democratic) 48.2%
Neal Dikeman (Libertarian) 0.3%
New senator elected.
|√ Mitt Romney (Republican) 62.5%|
Jenny Wilson (Democratic) 31.5%
Tim Aalders (Constitution) 2.7%
Craig Bowden (Libertarian) 2.3%
Reed McCandless (Independent American) 1.1%
Ryan Daniel Jackson (Independent) (write-in)
Caleb Dan Reeve (Independent) (write-in)
|Incumbent re-elected.||√ Bernie Sanders (Independent) 67.4%|
Lawrence Zupan (Republican) 27.4%
|Virginia||Tim Kaine||Democratic||2012||Incumbent re-elected.||√ Tim Kaine (Democratic) 56.9%|
Corey Stewart (Republican) 41.2%
Matt Waters (Libertarian) 1.9%
|Incumbent re-elected.||√ Maria Cantwell (Democratic) 58.6%|
Susan Hutchison (Republican) 41.4%
|West Virginia||Joe Manchin||Democratic||2010 (Special)|
|Incumbent re-elected.||√ Joe Manchin (Democratic) 49.5%|
Patrick Morrisey (Republican) 46.3%
Rusty Hollen (Libertarian) 4.2%
|Wisconsin||Tammy Baldwin||Democratic||2012||Incumbent re-elected.||√ Tammy Baldwin (Democratic) 54.9%|
Leah Vukmir (Republican) 45.1%
|Wyoming||John Barrasso||Republican||2007 (Appointed)|
|Incumbent re-elected.||√ John Barrasso (Republican) 67.1%|
Gary Trauner (Democratic) 30.1%
Joe Porambo (Libertarian) 2.8%
Sinema defeated McSally by a slim margin; her victory became official only after six days of counting ballots.
Four-term Democrat Dianne Feinstein won a special election in 1992 and was elected to full terms in 1994, 2000, 2006, and 2012. She is running for re-election and will advance to the general election after securing the top spot in the June 5 jungle primary.
President pro tempore of the California State Senate Kevin de León will advance to the general election after securing the second spot in the June 5 primary. Other Democratic candidates included community advocate Adrienne Nicole Edwards, Eugene Patterson Harris, David Hildebrand, Douglas Howard Pierce, and Alison Hartson.
Republican candidates included Paul Allen Taylor.
Derrick Michael Reid ran with the Libertarian Party.
Businessmen Matthew Corey received the Republican nomination.
Three-term Democrat Tom Carper won re-election with 66% of the vote in 2012. He announced he was running for re-election during an interview on MSNBC on July 24, 2017. He defeated Dover community activist Kerri Evelyn Harris for the Democratic nomination. Sussex County Councilman Robert Arlett won the Republican nomination.
Edward Janowski was running as an independent, but did not qualify.
Ron Curtis is the Republican nominee.
James Johnson is running as an independent.
One-term Independent Senator Angus King was elected in a three-way race with 53% of the vote in 2012. King has caucused with the Democratic Party since taking office in 2013, but he has left open the possibility of caucusing with the Republican Party in the future.
King is running.
Public school teacher and founder of UClass Zak Ringelstein ran unopposed for the Democratic nomination.
The election will be conducted with ranked choice voting, as opposed to "First-past-the-post voting", after Maine voters passed a citizen referendum approving the change in 2016 and a June 2018 referendum sustaining the change.
Tony Campbell, Evan Cronhardt, Nnabu Eze, Gerald Smith, and Blaine Taylor
Ben Cardin (Democratic)
Neal Simon (Independent)
Edward Shlikas (Independent) were seeking the Republican nomination, With Campbell winning.
Three-term Democrat Debbie Stabenow was re-elected with 59% of the vote in 2012.  She was renominated without Democratic opposition. On the Republican side, businessman John James was nominated. Independent candidate Marcia Squier is also running. She ran as a Green Party candidate for Michigan's 14th congressional district in 2016.
Two-term Democrat Al Franken announced that he would resign in December 2017, following allegations of sexual harassment. Mark Dayton, Governor of Minnesota, appointed Lt. Gov. Tina Smith on January 2, 2018, as an interim Senator until the November 2018 election. She defeated primary challenger Richard Painter in the Democratic primary held on August 14.
Incumbent Tina Smith is running against Republican Karin Housley in the general election for a full term ending January 3, 2021.
One-term Republican Roger Wicker won re-election with 57% of the vote in 2012. He was appointed in 2007 and won a special election in 2008 to serve the remainder of Trent Lott's term. He is running.
Seven-term Republican Thad Cochran, who won re-election with 59.9% of the vote in 2014, announced that he would resign April 1, 2018 due to health reasons. Phil Bryant, Governor of Mississippi, announced on March 21, 2018, that he would appoint Mississippi Agriculture Commissioner Cindy Hyde-Smith to fill the vacancy. She is running in the special election.
On November 6, a nonpartisan jungle primary took place on the same day as the regularly scheduled U.S. Senate election for the seat currently held by Roger Wicker. Party affiliations were not printed on the ballot. As no candidate gained 50% of the votes, a runoff special election between the top two candidates - Hyde-Smith and former United States Secretary of Agriculture Mike Espy - will be held on November 27.
State Auditor Matthew Rosendale won the Republican nomination in the June 5 primary. State Senator Albert Olszewski, former judge Russell Fagg, and Troy Downing also ran for the Republican nomination.
One-term Republican Deb Fischer was elected with 58% of the vote in 2012. She ran for and won the Republican nomination in the May 15 primary. Other Republicans who ran include retired professor Jack Heidel, Todd Watson, and Dennis Frank Macek.
Lincoln Councilwoman Jane Raybould ran for and won the Democratic nomination in the May 15 primary. Other Democrats who ran include Frank Svoboda, Chris Janicek, and Larry Marvin, who was a candidate in 2008, 2012, and 2014.
Jim Schultz is running for the Libertarian nomination.
Incumbent Republican Dean Heller is the Republican nominee. He was appointed to the seat in 2011 and then elected with 46% of the vote in 2012. Heller considered running for governor, but chose to seek re-election.
Nevada is the only state in the midterm elections that has an incumbent Republican Senator in a state that Hillary Clinton won in 2016.
Republican Bob Hugin was nominated to face two-term Democrat Bob Menendez, who was re-elected with 59% of the vote in 2012. Menendez was originally appointed to the seat in January 2006. He is running.
Aubrey Dunn Jr., New Mexico Commissioner of Public Lands and otherwise the first Libertarian to ever hold statewide elected office in history, announced his run for the seat, but stepped aside in August to allow former Governor of New Mexico, Gary Johnson's candidacy.
One-term Democrat Kirsten Gillibrand was elected with 72% of the vote in 2012. She had previously been appointed to the seat in 2009 and won a special election to remain in office in 2010. She is running.
Private equity executive Chele Chiavacci Farley has been nominated for U.S. Senate by the Republican and Conservative Parties.
U.S. Representative Jim Renacci ran for and won the Republican nomination in the May 8 primary. Other Republicans who ran include investment banker Michael Gibbons, businesswoman Melissa Ackison, Dan Kiley, and Don Elijah Eckhart.
Two-term Republican Bob Corker was re-elected with 65% of the vote in 2012. Senator Corker filed his Statement of Candidacy with the Secretary of the U.S. Senate to run for re-election, but on September 26, 2017, Senator Corker announced his intent to retire.
One-term Republican Ted Cruz was elected with 57% of the vote in 2012. He overwhelmingly won the Republican primary on March 6, 2018.Television producer Bruce Jacobson, Houston energy attorney Stefano de Stefano, former mayor of La Marque Geraldine Sam, Mary Miller, and Thomas Dillingham were Cruz's opponents.
Nurse Carl Bible ran as an independent.
Bob McNeil ran with the American Citizen Party.
Seven-term Republican Orrin Hatch was re-elected with 65% of the vote in 2012. Hatch is the President pro tempore of the United States Senate, as well as the second most-senior Senator. Before the 2012 election, Hatch said that he would retire at the end of his seventh term if he was re-elected. Hatch initially announced his re-election campaign on March 9, 2017, but later announced his plans to retire on January 2, 2018. Former 2012 Republican presidential nominee Mitt Romney was running for the seat.
Professor James Singer was running for the Democratic nomination, but he dropped out and endorsed Salt Lake County Councilwoman Jenny Wilson, who made her Senate bid official on July 17, 2017. Danny Drew also was running, but dropped out and endorsed Jenny Wilson. Mitchell Kent Vice was defeated for the Democratic nomination by Wilson.
Two-term Independent Senator Bernie Sanders was re-elected with 71% of the vote in 2012. Sanders, one of two independent members of Congress, has caucused with the Democratic Party since taking office in 2007. In November 2015, Sanders announced his plans to run as a Democrat, rather than an Independent, in all future elections. He won the nomination easily.
One-term Democrat Tim Kaine was elected with 53% of the vote in 2012. He was re-nominated unopposed. Prince William County Supervisor Corey Stewart is the Republican nominee. Matt Waters is the Libertarian nominee. Kaine defeated Stewart with 55.3% of the vote. Stewart received about 42.8% of the vote.
Washington hold non-partisan blanket primaries, in which the top two finishers advance to the general election regardless of party. Cantwell and former state Republican Party chair Susan Hutchison are facing each other in November.
One-term Democrat Joe Manchin was elected with 61% of the vote in 2012. He originally won the seat in a 2010 special election. Manchin is running for re-election and won the May 8 Democratic primary. Environmental activist Paula Jean Swearengin, also ran for the Democratic nomination.
West Virginia Attorney General Patrick Morrisey received the Republican nomination in the May 8 primary. Representative Evan Jenkins, coal miner Bo Copley, Jack Newbrough, Don Blankenship, and Tom Willis ran for the Republican nomination.
Below is a map of the total results of the Senate races across the country. Florida and Arizona are shaded all black as the final results are not determined.
The special election in Minnesota is not included but final results are found on the appropriate page.
The special election in Mississippi's results are not determined yet as the primary election on November, 6th resulted in a runoff election to be held in late November.
- Two seats (Florida and Mississippi) are currently undecided.
- Reflects the "classic" version of the forecast model.
- Special elections in Mississippi are nonpartisan. Party affiliation is not listed on the ballot.
- Mississippi will hold a run-off for the special election on November 27, 2018, because no candidate won a majority of the vote in the November 6, 2018 jungle primary.
- Wasserman, David (August 7, 2017). "The Congressional Map Has A Record-Setting Bias Against Democrats". FiveThirtyEight. Retrieved September 13, 2018.
- "Republicans Are Favorites In The Senate, But Democrats Have Two Paths To An Upset". FiveThirtyEight. September 12, 2018. Retrieved September 13, 2018.
- Matthew Yglesias (November 7, 2018). "4 winners and 2 losers from the 2018 midterm elections". Vox. Retrieved November 8, 2018.
- Igor Bobic (November 7, 2018). "Democrat Jacky Rosen Wins Nevada Senate Race". HuffPo. Retrieved November 12, 2018.
- James Arkin (November 12, 2018). "Sinema wins Arizona Senate race". Politico. Retrieved November 12, 2018.
- Staff writer (November 12, 2018). "Key midterm races still up for grabs". Politico. Retrieved November 12, 2018.
- Dick, Jason (January 20, 2016). "Senate Democrats, 2018 Math Is Not Your Friend". Roll Call. Retrieved August 2, 2016.
- Livingston, Abby (January 6, 2017). "Rep. Beto O'Rourke "very likely" to run for Sen. Ted Cruz's seat in 2018". The Texas Tribune. Retrieved January 19, 2017.
- Pramuk, Jacob (September 26, 2017). "Republican Sen. Bob Corker of Tennessee will not seek re-election, long-shot opportunity for Democrats". CNBC. Retrieved September 26, 2017.
- Kondik, Kyle (July 25, 2013). "Senate 2014 and Beyond". Sabato's Crystal Ball. Retrieved September 19, 2013.
- Fram, Alan (November 11, 2016). "Several Democrats facing 2018 re-election are from states Trump carried". PBS NewsHour. Retrieved November 12, 2016.
- "2016 State PVI Changes – Decision Desk HQ". decisiondeskhq.com. December 15, 2017.
- "2018 Senate Race Ratings". Cook Political Report. October 26, 2018.
- "Senate Ratings". Inside Elections. October 26, 2018.
- "2017-2018 Crystal Ball Senate race ratings map". University of Virginia Center for Politics. November 5, 2018.
- "2018 Election Calendar and Results". The New York Times. Retrieved January 24, 2018.
- "CNN Key Race Alert: This is the narrow path to a Democratic Senate". CNN. Retrieved September 9, 2018.
- "Battle for the Senate 2018". RCP. Retrieved March 28, 2018.
- "Fox News Midterms 2018 America's Election HQ". Fox News. Retrieved June 12, 2018.
- "Daily Kos Elections 2018 race ratings". Daily Kos. October 5, 2018.
- "Who wins 2018? Predictions for Every House & Senate Election". POLITICO. Retrieved September 8, 2018.
- Silver, Nate (September 12, 2018). "Forecasting the race for the Senate". FiveThirtyEight. Retrieved October 25, 2018.
- "Daily Kos Elections 2018 Primary Calendar". Daily Kos Elections. Retrieved January 30, 2018.
- "2018 Primary and Runoff Elections for Statewide offices and Congress Chronologically with Filing Deadlines". The Green Papers. Retrieved November 14, 2017.
- "2018 Poll Closing Times for Statewide office and Congress General Election Chronologically". The Green Papers. Retrieved November 14, 2017.
- "2018 Mississippi Candidate Qualifying List" (PDF). Mississippi Secretary of State. Retrieved March 24, 2018.
- Jeff Flake (October 24, 2017). "Flake Announces Senate Future". United States Senator Jeff Flake. Retrieved December 20, 2017.
- "2018 General Election". Arizona Secretary of State. Retrieved September 26, 2018.
- "Official Certified List of Candidates" (PDF). California Secretary of State. Retrieved September 27, 2018.
- "California Candidate List" (PDF). California Secretary of State. Retrieved March 24, 2018.
- Bass, Paul (December 23, 2016). "Murphy Navigates A Changed World". New Haven Independent. Retrieved December 29, 2016.
- Altimari, Danielle (August 22, 2017). "Corey Planning U.S. Senate Run Against Murphy". Hartford Courant. Retrieved August 22, 2017.
- "GENERAL ELECTION June 11, 2018 FILED CANDIDATES BY OFFICE". Florida Department of State. Retrieved September 27, 2018.
- "Candidate Listing for 2018 General Election". Florida Department of State. Retrieved April 10, 2018.
- "Candidates Filing Report". Hawaii Office of Election. Retrieved June 3, 2018.
- "Indiana Secretary of State Official Candidates" (PDF). Indiana Secretary of State. February 10, 2018. Retrieved February 10, 2018.
- "Candidate List - 2018 Primary Election" (PDF). Indiana Secretary of State. February 12, 2018. Retrieved February 12, 2018.
- Blake, Aaron (November 5, 2014). "Angus King and Joe Manchin are sticking with the Democrats. Because, of course". The Washington Post. Retrieved May 28, 2015.
- "Maine Candidates Lists". Lieutenant Governor Election. Retrieved September 2, 2018.
- "Maine became the first state in the country Tuesday to pass ranked choice voting". Boston Globe. November 10, 2016. Retrieved November 17, 2016.
- "Maine Voters Overrule Their Leaders". The Atlantic. June 15, 2018. Retrieved June 24, 2018.
- Emba, Christine. "Maryland election results 2018". The Washington Post. Retrieved November 10, 2018.
- Elections, Maryland State Board of. "2018 Candidate Listing". elections.state.md.us. Retrieved January 16, 2018.
- "Independent to launch bid for Senate in Maryland". POLITICO. Retrieved February 8, 2018.
- "Shlikas will fix it!". Shlikas for Senate. Retrieved December 20, 2017.
- "2018 State Primary - Democratic Candidates for Nomination". Secretary of the Commonwealth of Massachusetts. Retrieved June 6, 2018.
- "2018 State Primary - Republican Candidates for Nomination". Secretary of the Commonwealth of Massachusetts. Retrieved June 6, 2018.
- "Dr. Shiva Ayyadurai on Twitter: "Today Shiva 4 Senate dumped the MA GOP Establishment and Declared Our Independence". Twitter. November 11, 2017. Retrieved November 11, 2017.
- "2018 Michigan Candidate Listing". Michigan Secretary of State. Retrieved April 24, 2018.
- "Michigan's 14th Congressional District election, 2016 - Ballotpedia". Retrieved March 12, 2018.
- "Candidate Filings - 2018 State General Election". Minnesota Secretary of State. Retrieved May 31, 2018.
- Jacobs, Ben (March 5, 2018). "Mississippi Senator Thad Cochran announces he is stepping down". The Guardian. Retrieved March 5, 2018.
- The Washington Post. "Miss. governor names Cindy Hyde-Smith to replace GOP Sen. Thad Cochran. She will be first female U.S. senator from state". Retrieved March 21, 2018.
- Rakich, Nathaniel (March 6, 2018). "How Things Could Go Wrong For Republicans In Mississippi's New Senate Race". FiveThirtyEight. Retrieved April 28, 2018.
- Wagster Pettus, Emily (April 23, 2018). "5 candidates now in special US Senate race in Mississippi". The Seattle Times. Retrieved June 30, 2018.
- "Missouri Candidates Lists". Missouri Secretary of State. Retrieved March 17, 2018.
- "Montana Primary Candidates Lists". Montana Secretary of state.
- "Statewide Candidate List" (PDF). Nebraska Secretary of State. Retrieved September 2, 2018.
- "Official Nebraska Candidate Lists" (PDF). Nebraska Secretary of State. March 1, 2018. Retrieved March 2, 2018.
- "United States Senate election in Nevada, 2018".
- "Nevada Candidates Lists". Nevada Secretary of state.
- "Candidates for US Senate for GENERAL ELECTION" (PDF). New Jersey Election. Retrieved September 2, 2018.
- "New Mexico Major Parties Candidates". KRWG. Retrieved March 26, 2018.
- "Who Filed Report". New York State Board of Election. Retrieved April 10, 2018.
- "2018 Primary Contest Candidate List". North Dakota Secretary of State. Retrieved April 9, 2018.
- "Secretary of State Jon Husted Receives Statewide Candidate Petitions for May Primary". Ohio Secretary of State. Retrieved March 23, 2018.
- "Pennsylvania Candidates Lists". Pennsylvania Secretary of State. Retrieved March 20, 2018.
- "Candidates in Upcoming Elections". Rhode Island Department of State. Retrieved June 28, 2018.
- "Larry Crim Announces U.S. Senate 2018 Race For Seat Held By Corker". chattanoogan.com. Retrieved February 21, 2017.
- "Corker to end Senate career with this term". Retrieved September 26, 2017.
- "Tennessee candidates Lists" (PDF). Tennessee Secretary of State. Retrieved March 23, 2018.
- "November 6, 2018 General Election Ballot". Texas Secretary of State. Retrieved September 2, 2018.
- Wang, Jackie (November 16, 2017). "Christian TV producer challenging Sen. Ted Cruz in GOP primary". Dallas Morning News. Retrieved November 16, 2017.
- "Statement of Organization" (PDF). FEC Form 1. June 9, 2017. Retrieved June 14, 2017.
- Tinsley, Anna M. (November 11, 2017). "2018 Election: First day of filing begins with a rush of candidates". Fort Worth Star-Telegram. Retrieved November 16, 2017.
- "MILLER, MARY ANN - Candidate overview". FEC.gov.
- "Former Birdville schools employee joins GOP race to unseat Sen. Ted Cruz". Star-Telegram. Retrieved December 1, 2017.
- "HERNANDEZ, IRASEMA RAMIREZ - Candidate overview". FEC.gov.
- Tinsley, Anna (December 9, 2017). "Deadline for 2018 primary ballot: Monday. Here's who is already in the race". Fort Worth Star-Telegram. Retrieved December 17, 2017.
- "BIBLE, CARL ALEXANDER - Candidate overview". FEC.gov. Retrieved December 21, 2017.
- "AmericanCitizenParty.us". americancitizenparty.us.
- Lederman, Josh (March 3, 2012). "Hatch will retire in 2018 if he wins reelection". The Hill.
- Raju, Manu (March 9, 2017). "First on CNN: After lobbying from Trump, Orrin Hatch plans to run again". CNN. Retrieved March 11, 2017.
- Dennis Romboy (November 6, 2014). "Sen. Orrin Hatch leaves door ajar for run in 2018". Deseret News. Retrieved December 12, 2014.
- "Utah Candidats Lists". Utah Lieutenant Governor Election. Retrieved March 13, 2018.
- Tanner, Courtney (May 3, 2017). "Navajo candidate announces bid as Democrat for Hatch's seat". The Salt Lake Tribune. Retrieved June 13, 2017.
- Breiner, Andrew (June 21, 2017). "Navajo Candidate Drops Out of Race Against Hatch". Roll Call. Retrieved June 21, 2017.
- Schott, Bryan (April 12, 2017). "Another Democrat looking to knock off Hatch in 2008". Utah Policy. Retrieved April 12, 2017.
- "Thank You". Danny Drew For U.S. Senate. Retrieved October 3, 2017.
- "2018 General Election Candidates listing". Vermont Secretary of State. Retrieved August 14, 2018.
- "Certified Candidates and Ballot Order for June 12, 2018 Primary Elections" (PDF). Virginia Department of Elections. Retrieved April 5, 2018.
- "Waters for US Senate Turns in Over 14,000 Signatures". Christian Newswire. June 12, 2018. Retrieved November 8, 2018.
- "Kaine tops Stewart to retain Va. seat in US Senate". WTOP. November 6, 2018. Retrieved November 7, 2018.
- "2018 Candidates Who Have Filed". Washington Secretary of State. Retrieved May 18, 2018.
- "West Virginia Candidates Lists" (PDF). West Virginia Secretary of State. Retrieved March 4, 2018.
- "Candidate Tracking by Office" (PDF). Wisconsin Election Commission. Retrieved June 11, 2018.
- "2018 Primary Election Candidate Roster" (PDF). Wyoming Secretary of State. Retrieved May 23, 2018.