United States Senate elections, 2018
Class 1 (33 of the 100) seats in the United States Senate
51 seats needed for a majority
Senate seats up for election:
Elections for the United States Senate will be held on November 6, 2018, with 33 of the 100 seats in the Senate being contested in regular elections whose winners will serve six-year terms from January 3, 2019 until January 3, 2025. Currently, Democrats are expected to have 23 seats up for election, in addition to 2 independents who caucus with the Democrats. Republicans are expected to have 8 seats up for election. The seats up for election in 2018 were last up for election in 2012, although some seats may have special elections if incumbents die or resign. Democrats had a net gain of 2 seats in the 2012 Senate elections.
- 1 Partisan composition
- 2 Early predictions
- 3 Race summary
- 4 Complete list of races
- 4.1 Arizona
- 4.2 California
- 4.3 Connecticut
- 4.4 Delaware
- 4.5 Florida
- 4.6 Hawaii
- 4.7 Indiana
- 4.8 Maine
- 4.9 Maryland
- 4.10 Massachusetts
- 4.11 Michigan
- 4.12 Minnesota
- 4.13 Mississippi
- 4.14 Missouri
- 4.15 Montana
- 4.16 Nebraska
- 4.17 Nevada
- 4.18 New Jersey
- 4.19 New Mexico
- 4.20 New York
- 4.21 North Dakota
- 4.22 Ohio
- 4.23 Pennsylvania
- 4.24 Rhode Island
- 4.25 Tennessee
- 4.26 Texas
- 4.27 Utah
- 4.28 Vermont
- 4.29 Virginia
- 4.30 Washington
- 4.31 West Virginia
- 4.32 Wisconsin
- 4.33 Wyoming
- 5 See also
- 6 References
The partisan composition of the Senate going into the 2018 election will depend on the results of the and 2016 Senate elections. Among the 33 Class I Senators up for regular election in 2018, there will be 23 Democrats, 2 independents who caucus with the Senate Democrats, and 8 Republicans. If a Senate vacancy occurs between 2016 and 2018, there may be special elections before or during the 2018 election, depending on state law.
|Last election (2016)||TBD||TBD||TBD||100|
|Before this election||TBD||TBD||TBD||100|
|Class 2 (2014→2020)||11||22||0||33|
|Class 3 (2016→2022)||TBD||TBD||TBD||34|
|Class 1 (2012→2018)||23||8||2||33|
|Special: Class 2 & 3||0||0||0||0|
Democrats are expected to target the Senate seat in Nevada, while Republicans are expected to target Democratic-held seats in Indiana, Missouri, Montana, and North Dakota. Other races may also become competitive.
|California||Dianne Feinstein||Democratic||1992 (Special)
|Running||Bill Nelson (Democratic)
|Maine||Angus King||Independent||2012||Running||Angus King (Independent)
|Mississippi||Roger Wicker||Republican||2007 (Appointed)
|Nevada||Dean Heller||Republican||2011 (Appointed)
|New Jersey||Bob Menendez||Democratic||2006 (Appointed)
|New Mexico||Martin Heinrich||Democratic||2012||Unknown||TBD|
|New York||Kirsten Gillibrand||Democratic||2009 (Appointed)
|North Dakota||Heidi Heitkamp||Democratic||2012||Unknown||TBD|
|Pennsylvania||Bob Casey, Jr.||Democratic||2006
|Rhode Island||Sheldon Whitehouse||Democratic||2006
|Texas||Ted Cruz||Republican||2012||Running||Ted Cruz (Republican)|
|West Virginia||Joe Manchin||Democratic||2010 (Special)
|Running||Joe Manchin (Democratic)
|Wyoming||John Barrasso||Republican||2007 (Appointed)
Complete list of races
Thirty-three seats are up for election in 2018:
- Two Democrats are running for re-election.
- Twenty-one Democrats may seek re-election.
- One independent who caucuses with the Democrats may seek re-election.
- One independent is running for re-election.
- One Republican is retiring.
- Seven Republicans may seek re-election.
One-term Republican Senator Jeff Flake was elected with 49.2% of the vote in 2012. He will be 55 years old in 2018. Radio host, author and conservative commentator Laura Ingraham may move to Arizona to challenge Flake in the Republican primary. Other potential Republican candidates include Congressman Ben Quayle, Matt Salmon, and David Schweikert. Potential Democratic candidates include U.S. Representative Kyrsten Sinema, former U.S. Representative Gabby Giffords, and astronaut Mark Kelly.
Four-term Democratic Senator Dianne Feinstein won a special election in 1992 and was elected to full terms in 1994, 2000, 2006, and 2012. She won re-election in 2012 with 62.5% of the vote, taking the record for the most popular votes in any U.S. Senate election in history, having received 7.75 million votes. Feinstein is the Ranking Member of the Select Committee on Intelligence. She will be 85 years old in 2018.
If Feinstein retires, potential Democratic candidates include Governor Jerry Brown, former U.S. Secretary of Labor Robert Reich, Lieutenant Governor Gavin Newsom, California Attorney General Kamala Harris, California State Treasurer John Chiang, U.S. Congresswoman Linda Sanchez, U.S. Congresswoman Judy Chu, U.S. Congressman Tony Cardenas, U.S. Congressman Pete Aguilar, U.S. Congressman Ted Lieu, U.S. Congressman Xavier Becerra, U.S. Congresswoman Norma Torres, U.S. Congressman Raul Ruiz, U.S. Congressman Mark Takano, U.S. Congresswoman Karen Bass, former Mayor of Los Angeles Antonio Villaraigosa, Mayor of Los Angeles Eric Garcetti and California Secretary of State Alex Padilla.
One-term Democratic Senator Chris Murphy was elected with 54.8% of the vote in 2012. He will be 45 years old in 2018.
Three-term Democratic Senator Tom Carper won re-election with 66.4% of the vote in 2012. He will be 71 years old in 2018.
Three-term Democratic Senator Bill Nelson was re-elected with 55.2% of the vote in 2012. Nelson is Ranking Member of the United States Senate Committee on Commerce, Science and Transportation. He will be 76 years old in 2018. He has strongly hinted he will seek re-election to a fourth term in office. Potential Republican candidates include Chief Financial Officer of Florida Jeff Atwater, Florida Commissioner of Agriculture Adam Putnam, U.S. Representative Tom Rooney and Rick Scott, the Governor of Florida.
One-term Democratic Senator Mazie Hirono was elected with 62.6% of the vote in 2012. She will be 71 years old in 2018.
One-term Democratic Senator Joe Donnelly was elected with 50% of the vote in 2012. He will be 63 years old in 2018. Potential Republican candidates include U.S. House of Representatives Marlin Stutzman, State Speaker of the House Brian Bosma, Indianapolis Mayor Greg Ballard, and U.S. Representatives Susan Brooks, Luke Messer, and Todd Young.
One-term Independent Senator Angus King was elected in a three-way race with 52.9% of the vote in 2012. He will be 74 years old in 2018. 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 has indicated he will seek reelection. Republican Governor of Maine Paul LePage has stated he will run unless hired by a potential Donald Trump administration. 
Two-term Democratic Senator Ben Cardin was re-elected with 56% of the vote in 2012. He will be 75 years old in 2018.
One-term Democratic Senator Elizabeth Warren was elected with 53.7% of the vote in 2012. She will be 69 years old in 2018.
Three-term Democratic Senator Debbie Stabenow was re-elected with 58.8% of the vote in 2012. Stabenow is Ranking Member of the Senate Agriculture Committee. She will be 68 years old in 2018. Potential Republican candidates include Governor Rick Snyder, and U.S Representatives Justin Amash and Candice Miller.
Two-term Democratic Senator Amy Klobuchar was re-elected with 65.2% of the vote in 2012. She will be 58 years old in 2018. Republican Erik Paulsen and Democrats R.T. Rybak, Lori Swanson, and Tim Walz have been mentioned as potential candidates.
One-term Republican Senator Roger Wicker won re-election with 57.2% of the vote in 2012. He was appointed in 2007 won a special election in 2008 to serve the remainder of Trent Lott's term. He will be 67 years old in 2018.
Two-term Democratic Senator Claire McCaskill was re-elected with 54.8% of the vote in 2012. She will be 65 years old in 2018. Potential Republican challengers include U.S. Representative Ann Wagner.
Two-term Democratic Senator Jon Tester was re-elected with 48.58% of the vote in 2012. He will be 62 years old in 2018. Potential Republican candidates include U.S. Representative Ryan Zinke, former Governor Marc Racicot, and former State Senate Minority Leader Corey Stapleton.
One-term Republican Senator Deb Fischer was elected with 55.7% of the vote in 2012. She will be 67 years old in 2018.
One-term Republican Senator Dean Heller was elected with 45.9% of the vote in 2012. He had been appointed to the seat in 2011. He will be 58 years old in 2018. On the Democratic side, U.S. Representative Dina Titus, and former U.S. Representatives Shelley Berkley (who was the nominee in 2012) and Steven Horsford are potential candidates 
Two-term Democratic Senator Bob Menendez was re-elected with 58.9% of the vote in 2012. Menendez was originally appointed to the seat in January 2006. He will be 64 years old in 2018.
Polling by Harper Polling/Conservative Intel in March 2013 showed Thomas Kean, Jr. taking 41% of the vote in a hypothetical 2018 Republican primary matchup, with Kim Guadagno at 33%, Joseph M. Kyrillos at 12%, and 14% undecided. If Menendez were to retire, the poll showed that Richard Codey would lead a Democratic primary with 33% of the vote, followed by Rob Andrews (13%), Frank Pallone (13%) and Stephen M. Sweeney (6%) with 35% undecided. In a hypothetical general election, the poll showed that Kean would lead Andrews 33% to 17% with 50% undecided, and Codey would lead Kyrillos 34% to 25% with 41% undecided.
One-term Democratic Senator Martin Heinrich was elected with 51% of the vote in 2012. He will be 47 years old in 2018.
One-term Democratic Senator Kirsten Gillibrand was elected with 71.6% 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 will be 51 years old in 2018.
One-term Democratic Senator Heidi Heitkamp was elected with 50.2% of the vote in 2012. She will be 63 years old in 2018. Potential Republican candidates include Governor Jack Dalrymple, U.S. Representative Kevin Cramer, Lieutenant Governor Drew Wrigley, and former Governor and Secretary of Agriculture Ed Schafer.
Two-term Democratic Senator Sherrod Brown was re-elected with 50.7% of the vote in 2012. He will be 65 years old in 2018. Potential Republican candidates include Governor John Kasich, Ohio State Treasurer Josh Mandel, U.S. Representative Steve Stivers and Assistant Majority Whip in the Ohio House of Representatives Sarah LaTourette. Former Senator and current Ohio Attorney General Mike DeWine (who lost this Senate seat to Brown in 2006) had been speculated to run, but announced in May 2016 that he will instead run for Governor.
Two-term Democratic Senator Bob Casey, Jr. was re-elected with 53.7% of the vote in 2012. He will be 58 years old in 2018. Casey may consider running for governor, particularly if Governor Tom Wolf does not run for re-election. If Casey does not run for re-election, Attorney General Kathleen Kane, Auditor General Eugene DePasquale, and former Philadelphia Mayoe Michael Nutter are potential Democratic candidates. Potential Republican candidates include former Governor Tom Corbett, former Lieutenant Governor Jim Cawley, and Congressmen Pat Meehan, Charlie Dent, and Mike Kelly.
Two-term Democratic Senator Sheldon Whitehouse was reelected with 63.8% of the vote in 2012. He will be 63 years old in 2018.
Two-term Republican Senator Bob Corker was re-elected with 64.9% of the vote in 2012. Corker is the Chairman of the United States Senate Committee on Foreign Relations. He will be 66 years old in 2018. Corker may run for Governor of Tennessee in 2018.
Should Corker not run for re-election, possible Republican candidates include Governor Bill Haslam, Speaker of the Tennessee House of Representatives Beth Harwell, Tennessee Secretary of State Tre Hargett, Commissioner of the Department of Economic and Community Development Bill Hagerty and U.S. Representative Diane Black.
One-term Republican Senator Ted Cruz was elected with 56.5% of the vote in 2012. He will be 47 years old in 2018. Potential Democratic candidates include United States Secretary of Housing and Urban Development Julian Castro, Congressman Joaquin Castro, 2014 gubernatorial nominee and former State Senator Wendy Davis, and 2014 lieutenant gubernatorial nominee and State Senator Leticia Van de Putte. Potential Republican candidates include author, minister, and former Vice Chair of the Republican Party of Texas David Barton, Texas Land Commissioner George P. Bush, Lieutenant Governor Dan Patrick, and Congressmen Michael McCaul, Jeb Hensarling, and Louie Gohmert.
Seven-term Republican Senator Orrin Hatch was re-elected with 65.3% of the vote in 2012. Hatch is the President pro tempore of the Senate, as well as the second most-senior Senator. Hatch is the chairman of the Senate Finance Committee. He will be 84 years old in 2018. Before the 2012 election, Hatch said that he would retire at the end of his seventh term if he was re-elected. However he has since "left the door ajar", but has denied that he has changed his mind.
Former Republican Governors Jon Huntsman, Jr. and Mike Leavitt are potential candidates, as are state party chair Thomas Wright, former State Senator and 2012 candidate Dan Liljenquist, Attorney General Sean Reyes, Lieutenant Governor Spencer Cox, State Senator Aaron Osmond, Mitt Romney's son Josh Romney, and U.S. Representatives Jason Chaffetz, Chris Stewart and Mia Love
Two-term Independent Senator Bernie Sanders was re-elected with 71% of the vote in 2012. Sanders, one of two independent members of Congress, is a self-described democratic socialist. Sanders has caucused with the Democratic Party since taking office in 2007, and he is the Ranking Member of the Budget Committee. He will be 77 years old in 2018. Sanders is running for the 2016 Democratic presidential nomination. In November 2015, Sanders announced his plans to run as a Democrat rather than an Independent in all future elections.
One-term Democratic Senator Tim Kaine was elected with 52.9% of the vote in 2012. He will be 60 years old in 2018. Kaine is considered a potential 2016 Vice Presidential nominee, as well as a potential Cabinet Secretary.
Potential Republican candidates include former U.S. Representative and former House Majority Leader Eric Cantor, State Delegate Benjamin Cline, U.S. Representative Barbara Comstock, former Attorney General of Virginia and 2013 gubernatorial nominee Ken Cuccinelli, U.S. Representative Randy Forbes, former Attorney General of Virginia and 2005 gubernatorial nominee Jerry Kilgore, State Senator and 2013 Attorney General nominee Mark Obenshain, State Senator Jeff McWaters, State Senator Bryce Reeves U.S. Representative Scott Rigell. Former Republican National Committee Chairman and 2014 U.S. Senate nominee Ed Gillespie has been speculated to run, but he has said that he has no interest in doing so.
If Kaine vacates the seat, potential Democratic candidates include former State House Minority Leader Ward Armstrong, former Lieutenant Governor and U.S. Representative Don Beyer, Virginia Attorney General Mark Herring, Kaine's wife and Virginia Education Secretary Anne Holton, Lieutenant Governor Ralph Northam and former U.S. Representative Tom Perriello.
Three-term Democratic Senator Maria Cantwell was re-elected with 60.5% of the vote in 2012. Cantwell is the Ranking Member of the Committee on Energy and Natural Resources. She will be 60 years old in 2018.
One-term Democratic Senator Joe Manchin was elected with 60.6% of the vote in 2012. He originally won the seat in a 2010 special election. He will be 71 years old in 2018. Manchin is running for re-election. Other potential Democratic candidates include former U.S. Senator Carte Goodwin, State Senator Mike Green, and Delegates Doug Reynolds and Doug Skaff. Potential Republican candidates include U.S. Congressmen David McKinley and Evan Jenkins, state Attorney General Patrick Morrisey, delegate Erikka Storch, and Olympic gymnast Mary Lou Retton.
One-term Democratic Senator Tammy Baldwin was elected with 51.4% of the vote in 2012. She is the first openly gay Senator in U.S. history. She will be 56 years old in 2018. Potential Republican candidates include Lieutenant Governor Rebecca Kleefisch, and Congressman Sean Duffy.
One-term Republican Senator John Barrasso was elected with 75.7% of the vote in 2012. Barrasso was appointed to the seat in 2007, and won a special election in 2008. Barrasso is the Chairman of the Senate Committee on Indian Affairs. He will be 66 years old in 2018.
- Subject to change if vacancies occur in Class 2 or Class 3 Senate seats.
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