United States Senate elections, 2018 - wikipedia United States Senate elections, 2018 United States Senate elections, 2018 ← 2016 November 6, 2018 2020 → Class 1 ( 33 of the 100 ) seats in the United States Senate 51 seats needed for a majority Majority party Minority party Leader Mitch McConnell Chuck Schumer Party Republican Democratic Leader since January 3, 2007 January 3, 2017 Leader 's seat Kentucky New York Seats before 52 46 Seats up 8 23 Seats needed 3 * Third party Party Independent Seats before Seats up Rep. incumbent running Rep. incumbent retiring Dem. incumbent running Ind. incumbent running No election * Democrats need three seats if the Independents continue to caucus with them. Majority Leader before election Mitch McConnell Republican Elected Majority Leader TBD TBD Elections to 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 along with 2 independents who caucus with them. Republicans are expected to have 8 seats up for election, with one of those being an open seat as a result of Tennessee Senator Bob Corker 's shock decision to not seek re-election in 2018, having served since 2007. 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, as has already happened in Alabama. Democrats gained a net 2 seats in the 2016 Senate elections. The United States House of Representatives elections, 39 gubernatorial elections, and many other state and local elections will also be held on this date. Contents 1 Partisan composition 2 Most recent election predictions 3 Race summaries 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 Partisan composition Among the 33 Senators up for election in 2018 are 33 Class I Senators up for regular election. These consist of 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. The Alabama special election had been scheduled for 2018 but was moved to 2017. Parties Total Democratic Republican Independent Last election ( 2016 ) 46 52 100 Before this election 46 52 100 Not up 23 44 0 67 Class 2 ( 2014 → 2020 ) 11 22 0 33 Class 3 ( 2016 → 2022 ) 12 22 0 34 Up 23 8 33 Class 1 ( 2012 → 2018 ) 23 8 33 Special : Class 2 & 3 0 0 0 0 Incumbent retiring 0 0 Incumbent running 23 7 32 Intent undeclared 0 0 0 0 Most recent election predictions Democrats are expected to target the Republican - held Senate seats in Nevada and Arizona. Democrats could also target seats in Texas, Utah and Tennessee 's open - seat. Republicans are expected to target Democratic - held seats in Indiana, Missouri, Montana, North Dakota, and West Virginia, all of which voted for Mitt Romney in the 2012 election and Donald Trump in the 2016 election, as well as seats in Florida, Ohio, Pennsylvania, Wisconsin, and Michigan, all of which voted for Donald Trump in the 2016 election. Republicans could also target seats in Virginia, Maine, and New Jersey. Other races may also become competitive. State PVI Incumbent 2012 result Cook Sept 29, 2017 Roth. September 29, 2017 Sabato September 28, 2017 Arizona 105 ! R + 5 Flake, Jeff Jeff Flake ( R ) 049 ! 49 % R 100 ! Tossup 100 ! Tossup 100 ! Tossup California 088 ! D + 12 Feinstein, Dianne Dianne Feinstein ( D ) 037 ! 63 % D 096 ! Safe D 096 ! Safe D 096 ! Safe D Connecticut 094 ! D + 6 Murphy, Chris Chris Murphy ( D ) 045 ! 55 % D 096 ! Safe D 096 ! Safe D 096 ! Safe D Delaware 094 ! D + 6 Carper, Tom Tom Carper ( D ) 034 ! 66 % D 096 ! Safe D 096 ! Safe D 096 ! Safe D Florida 102 ! R + 2 Nelson, Bill Bill Nelson ( D ) 045 ! 55 % D 098 ! Lean D 099 ! Tilt D 098 ! Lean D Hawaii 082 ! D + 18 Hirono, Mazie Mazie Hirono ( D ) 037 ! 63 % D 096 ! Safe D 096 ! Safe D 096 ! Safe D Indiana 109 ! R + 9 Donnelly, Joe Joe Donnelly ( D ) 050 ! 50 % D 100 ! Tossup 100 ! Tossup 100 ! Tossup Maine 097 ! D + 3 King, Angus Angus King ( I ) 047 ! 53 % I 098 ! Lean D / I 096 ! Safe D / I 097 ! Likely D / I Maryland 088 ! D + 12 Cardin, Ben Ben Cardin ( D ) 045 ! 55 % D 096 ! Safe D 096 ! Safe D 096 ! Safe D Massachusetts 088 ! D + 12 Warren, Elizabeth Elizabeth Warren ( D ) 046 ! 54 % D 096 ! Safe D 096 ! Safe D 096 ! Safe D Michigan 099 ! D + 1 Stabenow, Debbie Debbie Stabenow ( D ) 041 ! 59 % D 097 ! Likely D 096 ! Safe D 097 ! Likely D Minnesota 099 ! D + 1 Klobuchar, Amy Amy Klobuchar ( D ) 035 ! 65 % D 096 ! Safe D 096 ! Safe D 096 ! Safe D Mississippi 109 ! R + 9 Wicker, Roger Roger Wicker ( R ) 057 ! 57 % R 104 ! Safe R 104 ! Safe R 104 ! Safe R Missouri 109 ! R + 9 McCaskill, Claire Claire McCaskill ( D ) 045 ! 55 % D 100 ! Tossup 100 ! Tossup 100 ! Tossup Montana 111 ! R + 11 Tester, Jon Jon Tester ( D ) 051 ! 49 % D 097 ! Likely D 099 ! Tilt D 098 ! Lean D Nebraska 114 ! R + 14 Fischer, Deb Deb Fischer ( R ) 056 ! 56 % R 104 ! Safe R 104 ! Safe R 104 ! Safe R Nevada 099 ! D + 1 Heller, Dean Dean Heller ( R ) 046 ! 46 % R 100 ! Tossup 100 ! Tossup 100 ! Tossup New Jersey 093 ! D + 7 Menendez, Bob Bob Menendez ( D ) 041 ! 59 % D 097 ! Likely D 096 ! Safe D 097 ! Likely D New Mexico 097 ! D + 3 Heinrich, Martin Martin Heinrich ( D ) 049 ! 51 % D 096 ! Safe D 096 ! Safe D 096 ! Safe D New York 089 ! D + 12 Gillibrand, Kirsten Kirsten Gillibrand ( D ) 028 ! 72 % D 096 ! Safe D 096 ! Safe D 096 ! Safe D North Dakota 116 ! R + 17 Heitkamp, Heidi Heidi Heitkamp ( D ) 050 ! 50 % D 098 ! Lean D 100 ! Tossup 098 ! Lean D Ohio 103 ! R + 3 Brown, Sherrod Sherrod Brown ( D ) 049 ! 51 % D 098 ! Lean D 098 ! Lean D 098 ! Lean D Pennsylvania 100 ! EVEN Casey Jr., Bob Bob Casey Jr. ( D ) 046 ! 54 % D 097 ! Likely D 098 ! Lean D 097 ! Likely D Rhode Island 090 ! D + 10 Whitehouse, Sheldon Sheldon Whitehouse ( D ) 036 ! 64 % D 096 ! Safe D 096 ! Safe D 096 ! Safe D Tennessee 114 ! R + 14 Corker, Bob Bob Corker ( R ) ( retiring ) 065 ! 65 % R 103 ! Likely R 104 ! Safe R 104 ! Safe R Texas 108 ! R + 8 Cruz, Ted Ted Cruz ( R ) 057 ! 57 % R 104 ! Safe R 104 ! Safe R 103 ! Likely R Utah 120 ! R + 20 Hatch, Orrin Orrin Hatch ( R ) 065 ! 65 % R 104 ! Safe R 104 ! Safe R 104 ! Safe R Vermont 085 ! D + 15 Sanders, Bernie Bernie Sanders ( I ) 029 ! 71 % I 096 ! Safe D 096 ! Safe D 096 ! Safe D / I Virginia 099 ! D + 1 Kaine, Tim Tim Kaine ( D ) 047 ! 53 % D 097 ! Likely D 097 ! Likely D 097 ! Likely D Washington 093 ! D + 7 Cantwell, Maria Maria Cantwell ( D ) 039 ! 61 % D 096 ! Safe D 096 ! Safe D 096 ! Safe D West Virginia 120 ! R + 19 Manchin, Joe Joe Manchin ( D ) 039 ! 61 % D 100 ! Tossup 100 ! Tossup 098 ! Lean D Wisconsin 100 ! EVEN Baldwin, Tammy Tammy Baldwin ( D ) 049 ! 51 % D 097 ! Likely D 099 ! Tilt D 098 ! Lean D Wyoming 125 ! R + 25 Barrasso, John John Barrasso ( R ) 076 ! 76 % R 104 ! Safe R 104 ! Safe R 104 ! Safe R Race summaries In these general elections, the winners will be elected for the term beginning January 2019. All of the elections involved the Class 1 seats ; ordered by state. State ( linked to summaries below ) Incumbent Intent / Results Candidates ( listed alphabetically ) Senator Party Electoral history Arizona Flake, Jeff Jeff Flake Republican 2012 Incumbent running Deedra Abboud ( Democratic ) Craig Brittain ( Republican ) Jeff Flake ( Republican ) Doug Marks ( Libertarian ) Jim Moss ( Democratic ) Chris Russell ( Democratic ) Richard Sherzan ( Democratic ) Kyrsten Sinema ( Democratic ) Nicolas Tutora ( Republican ) Kelli Ward ( Republican ) California Feinstein, Dianne Dianne Feinstein Democratic 1992 ( special ) 1994 2000 2006 2012 Incumbent running Donald R. Adams ( Independent ) Jerry Leon Carroll ( Independent ) Michael Eisen ( Independent ) Dianne Feinstein ( Democratic ) Tim Gildersleeve ( Independent ) Eugene Patterson Harris ( Democratic ) David Hildebrand ( Democratic ) Charles Junior Hodge ( Independent ) Timothy Charles Kalemkarian ( Republican ) Caren Lancona ( Republican ) Richard Thomas Mead ( Independent ) John Melendez ( Democratic ) Douglas Howard Pierce ( Democratic ) Joseph Sandberg Stephen James Schrader ( Republican ) Steve Stokes ( Democratic ) Connecticut Murphy, Chris Chris Murphy Democratic 2012 Incumbent running Ann - Marie Adams ( Democratic ) Matthew Corey ( Republican ) Chris Murphy ( Democratic ) Dominic Rapini ( Republican ) Delaware Carper, Tom Tom Carper Democratic 2000 2006 2012 Incumbent running Tykiem Booker ( Democratic ) Tom Carper ( Democratic ) Chuck Boyce ( Republican ) Florida Nelson, Bill Bill Nelson Democratic 2000 2006 2012 Incumbent running Joe Allen ( Independent ) Lateresa Ann Jones ( Republican ) Edward Janowski ( Independent ) Tamika Lyles ( Democratic ) Bill Nelson ( Democratic ) Marcia Roberta Thorne ( Republican ) Joe Wendt ( Libertarian ) Hawaii Hirono, Mazie Mazie Hirono Democratic 2012 Incumbent running Mazie Hirono ( Democratic ) Indiana Donnelly, Joe Joe Donnelly Democratic 2012 Incumbent running Mike Braun ( Republican ) Joe Donnelly ( Democratic ) Terry Henderson ( Republican ) Mark Hurt ( Republican ) Luke Messer ( Republican ) Todd Rokita ( Republican ) Kiel Richard Stone ( Republican ) Andrew Takami ( Republican ) Andrew U.D. Straw ( Disability Party ) Maine King, Angus Angus King Independent 2012 Incumbent running Eric Brakey ( Republican ) Angus King ( Independent ) Zak Ringlestein ( Democratic ) Maryland Cardin, Ben Ben Cardin Democratic 2006 2012 Incumbent running Ben Cardin ( Democratic ) Sam Faddis ( Republican ) Richard `` Rikki '' Vaughn ( Democratic ) Arvin Vohra ( Libertarian ) Debbie `` Rica '' Wilson ( Democratic ) Massachusetts Warren, Elizabeth Elizabeth Warren Democratic 2012 Incumbent running Elizabeth Warren ( Democratic ) Shiva Ayyadurai ( Republican ) Geoff Diehl ( Republican ) Mary Lindstrom ( Republican ) Darius Mitchell ( Republican ) Allen Waters ( Republican ) Heidi Wellman ( Republican ) James Devine ( Independent ) Joshua Ford ( Independent ) Michigan Stabenow, Debbie Debbie Stabenow Democratic 2000 2006 2012 Incumbent running John James ( Republican ) Robert P. Young Jr. ( Republican ) Craig Allen Smith ( Democratic ) Debbie Stabenow ( Democratic ) Marcia Squier ( independent ) Minnesota Klobuchar, Amy Amy Klobuchar Democratic 2006 2012 Incumbent running Amy Klobuchar ( Democratic ) Jim Newberger ( Republican ) Mississippi Wicker, Roger Roger Wicker Republican 2007 ( appointed ) 2008 ( special ) 2012 Incumbent running Jensen Bohren ( Democratic ) Roger Wicker ( Republican ) Missouri McCaskill, Claire Claire McCaskill Democratic 2006 2012 Incumbent running Angelica Earl ( Democratic ) Josh Hawley ( Republican ) Claire McCaskill ( Democratic ) Tony Monetti ( Republican ) Austin Petersen ( Republican ) Courtland Sykes ( Republican ) Montana Tester, Jon Jon Tester Democratic 2006 2012 Incumbent running Troy Downing ( Republican ) Ron Murray ( Republican ) Albert Olszewski ( Republican ) Matthew Rosendale ( Republican ) Jon Tester ( Democratic ) Nebraska Fischer, Deb Deb Fischer Republican 2012 Incumbent running Deb Fischer ( Republican ) Larry Marvin ( Democratic ) Jane Raybould ( Democratic ) Nevada Heller, Dean Dean Heller Republican 2011 ( appointed ) 2012 Incumbent running Jay Craddock ( Democratic ) Sarah Gazala ( Republican ) Dean Heller ( Republican ) Bobby Mahendra ( Democratic ) Jacky Rosen ( Democratic ) Jesse Sbaih ( Democratic ) Danny Tarkanian ( Republican ) New Jersey Menendez, Bob Bob Menendez Democratic 2006 ( appointed ) 2006 2012 Incumbent running Lisa McCormick ( Democratic ) Bob Menendez ( Democratic ) Sean A. Thom ( Democratic ) New Mexico Heinrich, Martin Martin Heinrich Democratic 2012 Incumbent running Martin Heinrich ( Democratic ) Mick Rich ( Republican ) New York Gillibrand, Kirsten Kirsten Gillibrand Democratic 2009 ( appointed ) 2010 ( special ) 2012 Incumbent running Kirsten Gillibrand ( Democratic ) Rafael Arden Jones Sr. ( Republican ) David A. Webber ( Republican ) North Dakota Heitkamp, Heidi Heidi Heitkamp Democratic 2012 Incumbent running Tom Campbell ( Republican ) Heidi Heitkamp ( Democratic ) Dustin Peyer ( Democratic ) Ohio Brown, Sherrod Sherrod Brown Democratic 2006 2012 Incumbent running Melissa Ackison ( Republican ) Sherrod Brown ( Democratic ) Don Elijah Eckhart ( Republican ) Michael Gibbons ( Republican ) Josh Mandel ( Republican ) Pennsylvania Casey Jr., Bob Bob Casey Jr. Democratic 2006 2012 Incumbent running Paul Addis ( Republican ) Cynthia Ayers ( Republican ) Lou Barletta ( Republican ) Jeff Bartos ( Republican ) Bob Casey Jr. ( Democratic ) Jim Christiana ( Republican ) Paul DeLong ( Republican ) Dale Kerns ( Libertarian ) Bobby Lawrence ( Republican ) Rick Saccone ( Republican ) Andrew Shecktor ( Republican ) Rhode Island Whitehouse, Sheldon Sheldon Whitehouse Democratic 2006 2012 Incumbent running Robert Flanders ( Republican ) Robert Nardolillo ( Republican ) Sheldon Whitehouse ( Democratic ) Tennessee Corker, Bob Bob Corker Republican 2006 2012 Incumbent retiring Bill Bailey ( Democratic ) Marsha Blackburn ( Republican ) Larry Crim ( Republican ) James Mackler ( Democratic ) Andy Ogles ( Republican ) Texas Cruz, Ted Ted Cruz Republican 2012 Incumbent running Ted Cruz ( Republican ) Stefano de Stefano ( Republican ) Aaron Gwaltney ( Independent ) Irasema Hernandez ( Democratic ) Dan McQueen ( Republican ) Beto O'Rourke ( Democratic ) Dustin Ray Webb ( Democratic ) Utah Hatch, Orrin Orrin Hatch Republican 1976 1982 1988 1994 2000 2006 2012 Incumbent running Orrin Hatch ( Republican ) Mitchell Kent Vice ( Democratic ) Jenny Wilson ( Democratic ) Craig Bowden ( Libertarian ) Vermont Sanders, Bernie Bernie Sanders Independent 2006 2012 Incumbent running Bernie Sanders ( Independent ) Jon Svitavsky ( Democratic ) Folasade Adeluola ( Democratic ) Virginia Kaine, Tim Tim Kaine Democratic 2012 Incumbent running Tim Kaine ( Democratic ) Corey Stewart ( Republican ) Ron Wallace ( Republican ) Washington Cantwell, Maria Maria Cantwell Democratic 2000 2006 2012 Incumbent running Maria Cantwell ( Democratic ) Jennifer `` GiGi '' Ferguson ( Democratic ) Clay Johnson ( Independent ) West Virginia Manchin, Joe Joe Manchin Democratic 2010 ( special ) 2012 Incumbent running Bo Copley ( Republican ) Scott Ernst ( Republican ) Evan Jenkins ( Republican ) Joe Manchin ( Democratic ) Patrick Morrisey ( Republican ) Paula Jean Swearengin ( Democratic ) Wisconsin Baldwin, Tammy Tammy Baldwin Democratic 2012 Incumbent running Tammy Baldwin ( Democratic ) Kevin Nicholson ( Republican ) John Schiess ( Republican ) Leah Vukmir ( Republican ) Mary Jo Walters ( Democratic ) Wyoming Barrasso, John John Barrasso Republican 2007 ( appointed ) 2008 ( special ) 2012 Incumbent running John Barrasso ( Republican ) State Senator Party Electoral history Intent / Results Candidates Incumbent Complete list of races Thirty - three seats are up for election in 2018 : Twenty - two Democrats are running for re-election. One Democrat may seek re-election. Two independents are running for re-election. Seven Republicans are running for re-election. One Republican is retiring. Arizona Main article : United States Senate election in Arizona, 2018 One - term Republican Senator Jeff Flake was elected with 49 % of the vote in 2012. He will be 55 years old in 2018. He is running. Former state senator Kelli Ward, pharmacist Nicolas Tutora, and owner, co-founder of IsAnybodyDown ? Craig Brittain are challenging Flake in the Republican primary. U.S. Rep. Kyrsten Sinema, Deedra Abboud, Jim Moss, Chris Russell, and Richard Sherzan are running for the Democratic nomination. California Main article : United States Senate election in California, 2018 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 will be 85 years old in 2018. She is running for re-election. Democrats challenging Dianne Feinstein include Eugene Patterson Harris, David Hildebrand, John `` Stuttering John '' Melendez, Douglas Howard Pierce,, Joseph Sandberg, and 2016 candidate Steve Stokes. Republican candidates include Timothy Charles Kalemkarian, Caren Lancona, and Stephen James Schrader. Independent candidates include biologist Michael Eisen, Donald R. Adams, Jerry Leon Carroll, Tim Gildersleeve, Charles Junior Hodge, and Richard Thomas Mead. Connecticut Main article : United States Senate election in Connecticut, 2018 One - term Democratic Senator Chris Murphy was elected with 55 % of the vote in 2012. He will be 45 years old in 2018. He is running for reelection. He is being challenged for the Democratic nomination by Ann - Marie Adams. Businessmen Matthew Corey and Dominic Rapini are seeking the Republican nomination. Delaware Main article : United States Senate election in Delaware, 2018 Three - term Democratic Senator Tom Carper won re-election with 66 % of the vote in 2012. He will be 71 years old in 2018. He announced he was running for re-election during an interview on MSNBC on July 24, 2017. Businessman Chuck Boyce is running for the Republican nomination. Florida Main article : United States Senate election in Florida, 2018 Three - term Democratic Senator Bill Nelson was re-elected with 55 % of the vote in 2012. Nelson will be 76 years old in 2018. He has strongly hinted he will seek re-election to a fourth term in office. He is being challenged for the Democratic nomination by Tamika Lyles. Latersa Ann Jones and Marcia Roberta Thorne are running for the Republican nomination. Florida Governor Rick Scott is seen as potential Republican candidate to challenge Nelson. Scott will be 65 years old in 2018. First elected in 2010 and re-elected in 2014, Scott 's term as Governor of Florida is set to end by January 2019, due to term limits. Joe Wendt is seeking the Libertarian Party nomination, while Joe Allen and Edward Janowski are running as independents. Hawaii Main article : United States Senate election in Hawaii, 2018 One - term Democratic Senator Mazie Hirono was elected with 63 % of the vote in 2012. She will be 71 years old in 2018. Indiana Main article : United States Senate election in Indiana, 2018 One - term Democratic Senator Joe Donnelly was elected with 50.04 % of the vote in 2012. He will be 63 years old in 2018. He is running. Congressmen Luke Messer and Todd Rokita, State Representative Mike Braun, attorney Mark Hurt, director of Purdue Polytechnic Institute Andrew Takami, Kiel Richard Stone, and Terry Henderson are running for the Republican nomination. Disability Party candidate Andrew U.D. Straw has registered his campaign officially with the Secretary of the U.S. Senate. Straw has run for U.S. House twice on disability platforms, once in Indiana 's Second District and once in Illinois ' Eighth District. Maine Main article : United States Senate election in Maine, 2018 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. This Senate election is scheduled to be the first in Maine to be conducted with ranked choice voting, as opposed to a simple plurality, after voters passed a citizen referendum approving the change in 2016. An advisory opinion by the Maine Supreme Judicial Court holding that ranked choice voting would be unconstitutional only affects state office elections, but some legislators seek to repeal the measure in full. King has indicated he will seek reelection. He will be 74 years old in 2018. State Senator Eric Brakey is running for the Republican nomination. Public school teacher and founder of UClass Zak Ringlestein is seeking the Democratic nomination. Maryland Main article : United States Senate election in Maryland, 2018 Two - term Democratic Senator Ben Cardin was re-elected with 56 % of the vote in 2012. He will be 75 years old in 2018. He is running. He is being challenged in the Democratic primary by Richard `` Rikki '' Vaughn and Debbie `` Rica '' Wilson. Sam Faddis is seeking the Republican nomination. Arvin Vohra, vice chairman of the Libertarian Party, is seeking the Libertarian Party nomination. Massachusetts Main article : United States Senate election in Massachusetts, 2018 One - term Democratic Senator Elizabeth Warren was elected with 54 % of the vote in 2012. She will be 69 years old in 2018. She is running. State Representative Geoff Diehl, Shiva Ayyadurai, former Romney aide Mary Lindstrom, Darius Mitchell, Allen Waters, and Heidi Wellman are running for the Republican nomination. John Devine and Joshua Ford are running as independents. Michigan Main article : United States Senate election in Michigan, 2018 Three - term Democratic Senator Debbie Stabenow was re-elected with 59 % of the vote in 2012. She will be 68 years old in 2018. She is running. She is being challenged in the Democratic primary by Craig Allen Smith. On the Republican side, businessman John James and retired Michigan Supreme Court chief justice Robert P. Young Jr. are running. Independent candidate Marcia Squier is also running. Minnesota Main article : United States Senate election in Minnesota, 2018 Two - term Democratic Senator Amy Klobuchar was re-elected with 65 % of the vote in 2012. She will be 58 years old in 2018. She is running. State Representative Jim Newberger is running for the Republican nomination. Mississippi Main article : United States Senate election in Mississippi, 2018 One - term Republican Senator 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 will be 67 years old in 2018. He is running. Jensen Bohren is seeking the Democratic nomination. Missouri Main article : United States Senate election in Missouri, 2018 Two - term Democratic Senator Claire McCaskill was re-elected with 55 % of the vote in 2012. She will be 65 years old in 2018. She is running. She is being challenged in the Democratic primary by Angelica Earl. Attorney General Josh Hawley, Libertarian presidential candidate in 2016 Austin Petersen, assistant dean of aviation at University of Central Missouri Tony Monetti, and Navy Vet and former congressional staffer for Arkansas Rep. Bruce Westerman, Courtland Sykes, are running for the Republican nomination. Others who have set up exploratory committees include State Representative Paul Curtman. Montana Main article : United States Senate election in Montana, 2018 Two - term Democratic Senator Jon Tester was re-elected with 49 % of the vote in 2012. He will be 62 years old in 2018. He is running. State Auditor Matthew Rosendale, State Senator Albert Olszewski, Troy Downing, and Ron Murray are running for the Republican nomination. State Secretary of State Corey Stapleton is also a potential Republican candidate. Ryan Zinke resigned from the House of Representatives to become United States Secretary of the Interior. He could step down from that position to run for the Senate seat. Nebraska Main article : United States Senate election in Nebraska, 2018 One - term Republican Senator Deb Fischer was elected with 56 % of the vote in 2012. She will be 67 years old in 2018. She is running. Larry Marvin, who was a candidate in 2008, 2012, and 2014, and Lincoln Councilwoman Jane Raybould are running for the Democratic nomination. Nevada Main article : United States Senate election in Nevada, 2018 One - term Republican Senator Dean Heller was elected with 46 % of the vote in 2012. He had been appointed to the seat in 2011. He will be 58 years old in 2018. Heller considered running for governor, but has since chosen to seek reelection. Danny Tarkanian and Sarah Gazala are challenging Heller in the Republican primary. Representative Jacky Rosen, Jay Craddock, Sujeet `` Bobby '' Narendra Mahendra, ( 2 ) and Jesse Sbaih are running for the Democratic nomination. New Jersey Main article : United States Senate election in New Jersey, 2018 Two - term Democratic Senator Bob Menendez was re-elected with 59 % of the vote in 2012. Menendez was originally appointed to the seat in January 2006. He will be 64 years old in 2018. He is running. Democrat Sean A. Thom is running. New Mexico Main article : United States Senate election in New Mexico, 2018 One - term Democratic Senator Martin Heinrich was elected with 51 % of the vote in 2012. He will be 47 years old in 2018. He is running. Mick Rich is seeking the Republican nomination. New York Main article : United States Senate election in New York, 2018 One - term Democratic Senator 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 will be 51 years old in 2018. She is running. Former United States Ambassador to Japan Caroline Kennedy, daughter of former President John F. Kennedy is reportedly considering running as a Democrat, 9 years after declining to replace Hillary Clinton 's vacant seat after becoming U.S. Secretary of State. Rafael Arden Jones Sr. and David A. Webber are running for the Republican nomination. North Dakota Main article : United States Senate election in North Dakota, 2018 One - term Democratic Senator Heidi Heitkamp was elected with 50 % of the vote in 2012. She will be 63 years old in 2018. She is running. Dustin Peyer is running for the Democratic nomination. State Senator Tom Campbell is running for the Republican nomination. Ohio Main article : United States Senate election in Ohio, 2018 Two - term Democratic Senator Sherrod Brown was re-elected with 51 % of the vote in 2012. He will be 65 years old in 2018. He is running. Ohio State Treasurer Josh Mandel, investment banker Michael Gibbons, businesswoman Melissa Ackison and Don Elijah Eckhart are running for the Republican nomination. Pennsylvania Main article : United States Senate election in Pennsylvania, 2018 Two - term Democratic Senator Bob Casey Jr. was re-elected with 54 % of the vote in 2012. He will be 58 years old in 2018. He is running. Republican candidates include U.S. Representative Lou Barletta, Pennsylvania House of Representatives members Rick Saccone and Jim Christiana, Berwick councilman Andrew Shecktor, Paul Addis, Cynthia Ayers, Jeff Bartos, Paul DeLong, and Robert `` Bobby '' Lawrence. In addition, Libertarian candidate Dale Kerns has announced his candidacy for this seat. Rhode Island Main article : United States Senate election in Rhode Island, 2018 Two - term Democratic Senator Sheldon Whitehouse was reelected with 64 % of the vote in 2012. He will be 63 years old in 2018. He is running. State Representative Robert Nardolillo and former Rhode Island Supreme Court Associate Justice Robert Flanders are running for the Republican nomination. Tennessee Main article : United States Senate election in Tennessee, 2018 Two - term Republican Senator Bob Corker was re-elected with 65 % of the vote in 2012. He will be 66 years old in 2018. Senator Corker filed his Statement of Candidacy with the Secretary of the U.S. Senate to run for reelection, but on September 26, 2017, Senator Corker announced his intent to retire. U.S. Representative Marsha Blackburn, Larry Crim, a perennial candidate who ran as a Democrat in 2012 and 2014, and Andy Ogles, former director of the Tennessee chapter of Americans for Prosperity, are running for the Republican nomination. Bill Bailey and James Mackler are seeking the Democratic nomination. Texas Main article : United States Senate election in Texas, 2018 One - term Republican Senator Ted Cruz was elected with 57 % of the vote in 2012. He will be 48 years old in 2018. He is running. Houston energy attorney Stefano de Stefano and former mayor of Corpus Christi Dan McQueen are also seeking the Republican nomination. U.S. Representative Beto O'Rourke is seeking the Democratic nomination. Other Democrats who are running include Irasema Ramirez Hernandez and Dustin Ray Webb. Aaron Gwaltney is running as an independent. Utah Main article : United States Senate election in Utah, 2018 Seven - term Republican Senator 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. 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 denied that he had changed his mind until March 9, 2017, when he announced his re-election campaign. 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 are also running for the Democratic nomination. Craig Bowden is running for the Libertarians. Vermont Main article : United States Senate election in Vermont, 2018 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 will be 77 years old in 2018. On July 28, 2016, Sanders announced he would return to the Senate as an Independent and two days later in an interview on Real Time with Bill Maher that he would run for re-election. In 2016, activist and journalist Al Giordano stated his intention to challenge Sanders for the Democratic nomination to protest Sanders 's 2016 presidential campaign, which Giordano claims has divided the Democratic Party. In 2017, however, Giordano announced he would not run for the seat. Virginia Main article : United States Senate election in Virginia, 2018 One - term Democratic Senator Tim Kaine was elected with 53 % of the vote in 2012. He will be 60 years old in 2018. He is running. Prince William County Supervisor Corey Stewart and Ron Wallace are seeking the Republican nomination. Washington Main article : United States Senate election in Washington, 2018 Three - term Democratic Senator Maria Cantwell was re-elected with 61 % of the vote in 2012. She will be 60 years old in 2018. She is running. Jennifer `` GiGi '' Ferguson is running. West Virginia Main article : United States Senate election in West Virginia, 2018 One - term Democratic Senator Joe Manchin was elected with 61 % 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. Environmental activist Paula Jean Swearengin is also running for the Democratic nomination. Representative Evan Jenkins, West Virginia Attorney General Patrick Morrisey, coal miner Bo Copley, and Scott Ernst are running for the Republican nomination. Wisconsin Main article : United States Senate election in Wisconsin, 2018 One - term Democratic Senator Tammy Baldwin was elected with 51 % of the vote in 2012. She will be 56 years old in 2018. She is running. Mary Jo Walters, a Democratic candidate for Lieutenant Governor in the 2014 primary, and later that year a write - in candidate for Governor is also seeking the Democratic nomination. State Senator Leah Vukmir, businessman and member of Wisconsin Board of Veterans Affairs Kevin Nicholson and John Schiess are running for the Republican nomination. Wyoming Main article : United States Senate election in Wyoming, 2018 One - term Republican Senator John Barrasso was elected with 76 % of the vote in 2012. Barrasso was appointed to the seat in 2007, and won a special election in 2008. He will be 66 years old in 2018. 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Retrieved October 7, 2017. ^ Jump up to : Kimbel - Sannit, Arren ( March 11, 2017 ). `` Flake likely to face challenges from all sides, vows to be ready ''. Arizona Daily Star. Retrieved March 12, 2017. Jump up ^ `` MARKS, DOUG - Candidate overview - FEC.gov ''. FEC.gov. ^ Jump up to : `` MOSS, JIM - Candidate overview - FEC.gov ''. FEC.gov. ^ Jump up to : `` RUSSELL, DALE CHRISTOPHER - Candidate overview - FEC.gov ''. FEC.gov. ^ Jump up to : Nowicki, Dan ( July 15, 2017 ). `` How much re-election trouble is Sen. Jeff Flake really in ? ''. The Arizona Republic. Retrieved July 21, 2017. ^ Jump up to : Hansen, Ronald ( Sep 28, 2017 ). `` Rep. Kyrsten Sinema enters Senate race, hoping to unseat Jeff Flake ''. Retrieved Oct 4, 2017. ^ Jump up to : `` TUTORA, NICHOLAS - Candidate overview - FEC.gov ''. FEC.gov. ^ Jump up to : Min Kim, Seung ( October 27, 2016 ). `` Kelli Ward aims to oust Flake in 2018 ''. Politico. Retrieved November 10, 2016. ^ Jump up to : `` ADAMS, DONALD R - Candidate overview - FEC.gov ''. FEC.gov. ^ Jump up to : `` CARROLL, JERRY LEON - Candidate overview - FEC.gov ''. FEC.gov. ^ Jump up to : `` Q&A : Michael Eisen bids to be first fly biologist in the U.S. Senate ''. Science. AAAS. Retrieved January 27, 2017. ^ Jump up to : Wire, Sarah D. ( October 9, 2017 ). `` Sen. Dianne Feinstein says she 'll run again : ' There 's still so much work left to do ' ''. Los Angeles Times. Retrieved October 9, 2017. ^ Jump up to : `` GILDERSLEEVE, TIM - Candidate overview - FEC.gov ''. FEC.gov. ^ Jump up to : `` HARRIS, EUGENE PATTERSON - Candidate overview - FEC.gov ''. FEC.gov. ^ Jump up to : `` HILDEBRAND, DAVID - Candidate overview - FEC.gov ''. FEC.gov. ^ Jump up to : `` HODGE, CHARLES JUNIOR - Candidate overview - FEC.gov ''. FEC.gov. Jump up ^ `` KALEMKARIAN, TIMOTHY CHARLES - Candidate overview - FEC.gov ''. FEC.gov. 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Retrieved December 29, 2016. ^ Jump up to : McGuiness, Dylan ( June 27, 2017 ). `` Branford Republican Announces Campaign for U.S. Senate ''. Hartford Courant. Retrieved July 13, 2017. Jump up ^ `` United States Senate election in Delaware, 2018 - Ballotpedia ''. Retrieved 2017 - 10 - 05. ^ Jump up to : `` Kailani Koenig on Twitter ''. July 24, 2017. Retrieved July 24, 2017. ^ Jump up to : McAneny, DJ ( March 22, 2017 ). `` Republican candidate throws hat in the ring to target Sen. Tom Carper 's seat in 2018 ''. WDEL. Retrieved April 1, 2017. ^ Jump up to : `` Florida 2017 General Election ''. Thegreenpapers.com. Retrieved 2017 - 08 - 25. ^ Jump up to : `` JONES, LATERESA ANN - Candidate overview - FEC.gov ''. FEC.gov. ^ Jump up to : `` LYLES, TAMIKA - Candidate overview - FEC.gov ''. FEC.gov. ^ Jump up to : `` Bill Nelson on 2018, possible challenge from Rick Scott : I 'll run ' like there 's no tomorrow. ' ''. Tampa Bay Times. Retrieved November 22, 2016. ^ Jump up to : `` THORNE, MARCIA ROBERTA - Candidate overview - FEC.gov ''. FEC.gov. Jump up ^ Blair, Chad ( January 2, 2017 ). `` Warren Makes Pitch For Hirono ''. Honolulu Civil Beat. Retrieved February 23, 2017. ^ Jump up to : `` Mike Braun Officially Joins Senate Race ''. WIKY. August 9, 2017. Retrieved August 10, 2017. ^ Jump up to : Tully, Matthew ( December 2, 2016 ). `` His party defeated, Donnelly looks forward ''. The Indianapolis Star. Retrieved December 30, 2016. ^ Jump up to : Colombo, Hayleigh ( April 8, 2017 ). `` Republicans jockey to take on Donnelly in 2018 ''. Indiana Business Journal. Retrieved August 10, 2017. ^ Jump up to : Myers, George ( February 1, 2017 ). `` UPDATE : Kokomo lawyer Mark Hurt announces US Senate bid ''. Kokomo Tribune. Retrieved February 8, 2017. ^ Jump up to : `` Indiana Rep. Luke Messer announces 2018 Senate bid ''. Theindychannel.com. 2017 - 07 - 26. Retrieved 2017 - 08 - 25. ^ Jump up to : Carden, Dan ( August 9, 2017 ). `` Rokita running for U.S. Senate to ' Defeat the elite ' ''. NWI Times. Retrieved August 10, 2017. ^ Jump up to : `` STONE, KIEL RICHARD - Candidate overview - FEC.gov ''. FEC.gov. ^ Jump up to : Beilman, Elizabeth ( April 11, 2017 ). `` Purdue Polytechnic director Andrew Takami to run for U.S. Senate in 2018 ''. News and Tribune. Jump up ^ `` STRAW, ANDREW UD - Candidate overview - FEC.gov ''. FEC.gov. ^ Jump up to : Shepherd, Michael ( April 3, 2017 ). `` GOP state senator Eric Brakey kicks off underdog 2018 bid to unseat Angus King ''. Bangor Daily News. Retrieved April 25, 2017. ^ Jump up to : `` Senator King Responds to LePage 's Possible Senate Run in 2018 WABI TV5 ''. Retrieved November 22, 2016. ^ Jump up to : `` Educator Ringlestein declares candidacy for U.S. Senate seat ''. WGME. October 6, 2017. Retrieved October 7, 2017. Jump up ^ Fritze, John ( July 14, 2017 ). `` Ben Cardin raises nearly $1 M for 2018 reelection ''. The Baltimore Sun. Retrieved August 22, 2017. ^ Jump up to : `` FADDIS, CHARLES S - Candidate overview - FEC.gov ''. FEC.gov. ^ Jump up to : `` 2018 Candidate Listing ''. Maryland State Board of Elections. Retrieved August 4, 2017. ^ Jump up to : Vohra, Arvin ( July 4, 2017 ). `` Arvin Vohra, Vice Chairman of Libertarian Party, Announces Run for UsS Senate ''. Independent Political Report. Retrieved October 7, 2017. ^ Jump up to : Hagan, Lisa ( January 6, 2017 ). `` Warren says she will run for reelection ''. The Hill. Retrieved January 7, 2017. ^ Jump up to : Garcia, Eric ( March 29, 2017 ). `` Man Who Claims He Invented Email Files to Challenge Warren ''. Roll Call. Retrieved April 25, 2017. ^ Jump up to : O'Sullivan, Jim ( April 5, 2017 ). `` GOP 's Geoff Diehl sets stage to challenge Elizabeth Warren ''. The Boston Globe. Retrieved July 11, 2017. ^ Jump up to : O'Sullivan, Jim ( August 21, 2017 ). `` GOP 's Beth Lindstrom to launch challenge to Elizabeth Warren in 2018 ''. The Boston Globe. Retrieved August 21, 2017. ^ Jump up to : `` MITCHELL, DARIUS - Candidate overview - FEC.gov ''. FEC.gov. ^ Jump up to : Phillips, Frank ( January 12, 2017 ). `` GOP Senate candidate readies for ' street fight ' ''. The Boston Globe. Retrieved April 25, 2017. ^ Jump up to : `` WELLMAN, HEIDI M - Candidate overview - FEC.gov ''. FEC.gov. ^ Jump up to : `` DEVINE, JOHN P - Candidate overview - FEC.gov ''. FEC.gov. ^ Jump up to : Gallerani, Katheryn ( March 17, 2017 ). `` Joshua Ford declares for U.S. Senate ''. Kingston Reporter. Retrieved August 22, 2017. Jump up ^ http://www.freep.com/story/news/local/michigan/2017/09/21/john-james-u-s-senate-debbie-stabenow/689425001/ Jump up ^ `` Former state Supreme Court Justice Bob Young officially running for U.S. Senate ''. MLive.com. June 28, 2017. Retrieved 2017 - 08 - 25. ^ Jump up to : `` Democrats target the wrong Rep. Upton ''. Detroitnews.com. April 20, 2017. Retrieved 2017 - 08 - 25. ^ Jump up to : Oosting, Jonathan ( February 11, 2017 ). `` Michigan Democrats promise ' fight ' at record convention ''. The Detroit News. Retrieved February 13, 2017. Jump up ^ http://www.detroitnews.com/story/news/politics/2017/05/18/politcal-insider/101815922/ ^ Jump up to : Sherry, Allison ( December 25, 2016 ). `` Klobuchar will run again for Senate, rules herself out for governor 's race ''. Star Tribune. Retrieved December 26, 2016. ^ Jump up to : Stassen - Berger, Rachel ( August 5, 2017 ). `` Challenger emerges to run against U.S. Sen. Amy Klobuchar - GOP state Representative Jim Newberger ''. Pioneer Press. Retrieved August 10, 2017. ^ Jump up to : `` BOHREN, JENSEN MR - Candidate overview - FEC.gov ''. FEC.gov. ^ Jump up to : `` Former President Bush to attend private event in Jackson ''. Starkville Daily News. June 1, 2017. Retrieved June 5, 2017. ^ Jump up to : McDermott, Kevin ( August 9, 2017 ). `` McCaskill faces primary challenge from the left by political novice ''. St. Louis Post-Dispatch. Retrieved August 12, 2017. ^ Jump up to : Egger, Andrew ( October 10, 2017 ). `` Josh Hawley Running for Claire McCaskill 's Missouri Senate Seat ''. The Weekly Standard. Retrieved October 10, 2017. ^ Jump up to : `` Missouri Sen. Claire McCaskill announces 2018 run McClatchy DC ''. Retrieved November 22, 2016. ^ Jump up to : `` Monetti seeks Senate seat ''. The Daily - Star Journal. Apr 6, 2017. Retrieved July 2, 2017. ^ Jump up to : Bentley, Robert ( July 3, 2017 ). `` Breaking News : Austin Petersen Running for U.S. Senate in Missouri as a Republican ''. The Libertarian Vindicator. Retrieved July 4, 2017. ^ Jump up to : `` COURTLAND & CHANEL - SykesforSenate ''. Retrieved September 29, 2017. ^ Jump up to : `` DOWNING, TROY - Candidate overview - FEC.gov ''. FEC.gov. ^ Jump up to : `` MURRAY, RONALD - Candidate overview - FEC.gov ''. FEC.gov. ^ Jump up to : Michels, Holly K. ( April 11, 2017 ). `` Republican Olszewski says he 's going to run against Tester in 2018 ''. Independent Record. Retrieved April 11, 2017. ^ Jump up to : Calvan, Bobby ( July 31, 2017 ). `` Montana Auditor says he 'll seek US Senate Seat ''. Great Falls Tribune. Retrieved July 31, 2017. ^ Jump up to : Bragg, Dennis. `` Tester says he 'll run for re-election in ' 18 ''. kpax.com. Retrieved February 21, 2017. ^ Jump up to : Walton, Don ( June 18, 2017 ). `` Don Walton : Deb Fischer embarks on re-election bid ''. Lincoln Journal Star. Retrieved September 14, 2017. ^ Jump up to : `` MARVIN, LARRY - Candidate overview - FEC.gov ''. FEC.gov. ^ Jump up to : Walton, Don ( August 25, 2017 ). `` Jane Raybould will challenge Sen. Deb Fisher ''. Lincoln Journal Star. Retrieved August 26, 2017. ^ Jump up to : Pearce, Ed ( Apr 26, 2017 ). `` Running for office by walking the state, top to bottom ''. KOLO - TV. Retrieved July 9, 2017. ^ Jump up to : `` Sarah Gazala for US Senate 2018 ''. YouTube. September 23, 2018. Retrieved September 29, 2017. ^ Jump up to : Howell Jr., Tom ( December 29, 2016 ). `` Dean Heller rules out Nevada governor bid, will seek re-election in 2018 ''. The Washington Times. Retrieved December 30, 2016. ^ Jump up to : `` MAHENDRA, SUJEET BOBBY NARENDRA - Candidate overview - FEC.gov ''. FEC.gov. ^ Jump up to : CNN, Dean Merica, Eric Bradner and Jasmine Lee ( June 19, 2017 ). `` Rosen to challenge Sen. Dean Heller in Nevada ''. CNN. Retrieved June 21, 2017. ^ Jump up to : `` SBAIH, JESSE - Candidate overview - FEC.gov ''. FEC.gov. ^ Jump up to : Snyder, Riley ; Messerly, Megan ( August 8, 2017 ). `` Tarkanian announces bid for U.S. Senate, says will challenge Heller in Republican primary in 2018 ''. The Nevada Independent. Retrieved August 10, 2017. Jump up ^ `` DDHQ 2018 Senate Races Ratings -- Democratic Seats ( Part I ) -- Decision Desk HQ ''. decisiondeskhq.com. Retrieved July 8, 2017. ^ Jump up to : Hagen, Lisa ( March 25, 2017 ). `` Corruption trial could roil NJ Senate race ''. The Hill. Retrieved April 1, 2017. ^ Jump up to : `` THOM, SEAN A - Candidate overview - FEC.gov ''. FEC.gov. ^ Jump up to : Coleman, Michael ( November 10, 2016 ). `` Who wants to be New Mexico 's next governor ? ''. Albuquerque Journal. Retrieved November 10, 2016. ^ Jump up to : `` RICH, MICK - Candidate overview - FEC.gov ''. FEC.gov. ^ Jump up to : `` Kirsten Gillibrand Wants More Federal Funds to Protect Mosques and Synagogues ''. observer.com. December 4, 2016. Retrieved February 21, 2017. ^ Jump up to : `` JONES, RAFAEL ARDEN SR - Candidate overview - FEC.gov ''. FEC.gov. ^ Jump up to : `` WEBBER, DAVID A - Candidate overview - FEC.gov ''. FEC.gov. ^ Jump up to : Springer, Patrick ( August 16, 2017 ). `` North Dakota Republican announces he 's running for Heitkamp 's seat ''. The Forum of Fargo - Moorhead. Retrieved August 16, 2017. ^ Jump up to : Dalrymple, Amy ( August 16, 2017 ). `` Heitkamp announces re-election bid for 2018 ''. The Bismarck Tribune. Retrieved September 14, 2017. ^ Jump up to : Carney, Jordain ( April 18, 2017 ). `` Sanders supporter to run against red - state Democrat ''. The Hill. Retrieved April 25, 2017. ^ Jump up to : Koff, Stephen ( September 2, 2017 ). `` Another candidate, with a Trump connection, will challenge Josh Mandel in U.S. Senate primary ''. The Plain Dealer. Retrieved September 2, 2017. ^ Jump up to : Gomez, Henry J. ( January 9, 2017 ). `` Sen. Sherrod Brown taps Justin Barasky to manage re-election campaign ''. The Plain Dealer. Retrieved January 11, 2017. ^ Jump up to : Schladen, Marty ( September 14, 2017 ). `` Republican Eckhart declares Ohio Senate bid ''. The Columbus Dispatch. Retrieved September 16, 2017. ^ Jump up to : Tobias, Andrew ( May 31, 2017 ). `` Cleveland banker Mike Gibbons to run for U.S. Senate, setting up GOP primary against Josh Mandel ''. The Plain Dealer. Retrieved May 31, 2017. ^ Jump up to : Tobias, Andrew ( December 7, 2016 ). `` Ohio Treasurer Josh Mandel announces 2018 U.S. Senate run for Sherrod Brown 's seat ''. The Plain Dealer. Retrieved December 7, 2016. ^ Jump up to : Levy, Marc ( June 7, 2017 ). `` Ex-Energy Exec Enters Pennsylvania 's US Senate Race ''. WESA.fm. Retrieved July 2, 2017. ^ Jump up to : `` AYERS, CYNTHIA ELLEN - Candidate overview - FEC.gov ''. FEC.gov. ^ Jump up to : Estepa, Jessica ( August 29, 2017 ). `` Lou Barletta announces challenge to Sen. Bob Casey in 2018 Senate race ''. USA Today. Retrieved August 29, 2017. ^ Jump up to : engelkemier, Paul ( April 24, 2017 ). `` Bartos Jumps into Senate Race ''. PoliticsPa.com. Retrieved July 2, 2017. ^ Jump up to : `` Will Pa. go red in 2018 elections, too ? ''. Retrieved November 22, 2016. ^ Jump up to : `` Christiana says he 's candidate for U.S. Senate ''. Pittsburgh Post-Gazette. April 8, 2017. ^ Jump up to : `` DELONG, PAUL FREDERICK - Candidate overview - FEC.gov ''. FEC.gov. Jump up ^ `` Guest Column : An early candidacy for U.S. Senate ''. Delcotimes.com. 2016 - 11 - 21. Retrieved 2017 - 08 - 25. ^ Jump up to : Howley, Patrick ( May 23, 2017 ). `` EXCLUSIVE : Trumper Bobby Lawrence Announces Senate Run in Pennsylvania ''. Big League Politics. Retrieved July 2, 2017. ^ Jump up to : `` Saccone seeking Casey 's U.S. Senate seat in 2018 ''. post-gazette.com. Retrieved February 21, 2017. ^ Jump up to : `` Ex-Trump delegate from Pennsylvania to run for U.S. Senate ''. Pennlive.com. March 1, 2017. ^ Jump up to : `` FLANDERS, ROBERT MR - Candidate overview - FEC.gov ''. FEC.gov. ^ Jump up to : `` NARDOLILLO, ROBERT ANTHONY III - Candidate overview - FEC.gov ''. FEC.gov. ^ Jump up to : Gregg, Katherine ( December 22, 2016 ). `` Sen. Whitehouse : ' Plenty of opportunity for us to have fights with the president ' ''. The Providence Journal. Retrieved December 27, 2016. ^ Jump up to : Miller, Amy Beth ( September 3, 2017 ). `` Sevierville 's Bill Bailey aiming for Corker 's U.S. Senate seat ''. The Daily Times. Retrieved September 4, 2017. ^ Jump up to : Robillard, Kevin ( October 5, 2017 ). `` Blackburn enters Tennessee Senate race, as Haslam passes ''. Politico. Retrieved October 8, 2017. ^ Jump up to : `` Larry Crim Announces U.S. Senate 2018 Race For Seat Held By Corker ''. The Chatanoogan.com. November 10, 2016. Retrieved November 18, 2016. ^ Jump up to : `` MACKLER, JAMES - Candidate overview - FEC.gov ''. FEC.gov. ^ Jump up to : Ebert, Joel ; Boucher, Dave ( September 14, 2017 ). The Tennessean http://www.tennessean.com/story/news/2017/09/14/conservative-activist-andy-ogles-launches-u-s-senate-bid-seat-held-corker/665500001/. Retrieved September 30, 2017. Missing or empty title = ( help ) ^ Jump up to : Sullivan, Sean ( May 11, 2016 ). `` Ted Cruz files to run for reelection to the Senate in 2018 ''. The Washington Post. Retrieved July 25, 2016. ^ Jump up to : `` Statement of Organization '' ( PDF ). FEC Form 1. June 9, 2017. Retrieved June 14, 2017. ^ Jump up to : `` Election news for June 8 ''. TXElects.com. June 8, 2017. Retrieved August 18, 2017. ^ Jump up to : `` HERNANDEZ, IRASEMA RAMIREZ - Candidate overview - FEC.gov ''. FEC.gov. ^ Jump up to : Woolbright, Matt ( August 9, 2017 ). `` EXCLUSIVE : Former mayor Dan McQueen announces U.S. Senate bid ''. Caller - Times. Retrieved August 10, 2017. Jump up ^ Tracy, Abigail ( May 31, 2017 ). `` Meet the Kennedyesque Democrat trying to beat Ted Cruz ''. Vanity Fair. Retrieved July 13, 2017. ^ Jump up to : `` WEBB, DUSTIN RAY - Candidate overview - FEC.gov ''. FEC.gov. ^ Jump up to : Raju, Manu ( March 9, 2017 ). `` First on CNN : After lobbying from Trump, Orrin Hatch plans to run again ''. CNN. Retrieved March 11, 2017. ^ Jump up to : Witham, Joseph ( May 22, 2017 ). `` Mitchell Vice joins 2 other Democrats vying for Hatch 's Senate seat in 2018 ''. St. George News. Retrieved August 18, 2017. ^ Jump up to : Burr, Thomas ( July 17, 2017 ). `` SL County Councilwoman Wilson launches 2018 Senate bid, hoping to take on Orrin Hatch ''. The Salt Lake Tribune. Retrieved July 17, 2017. ^ Jump up to : `` BOWDEN, CRAIG - Candidate overview - FEC.gov ''. FEC.gov. ^ Jump up to : `` No, Sanders did NOT file for re-election as an independent in 2018. ''. Retrieved November 22, 2016. ^ Jump up to : Hirschfield, Peter ( July 6, 2017 ). `` Little - Known Challengers Seek To Unseat Bernie Sanders In 2018 ''. Vermont Public Radio. Retrieved July 7, 2017. ^ Jump up to : `` Tim Kaine Will Not Run for President or VP in 2020 ''. Retrieved November 22, 2016. ^ Jump up to : Wilson, Patrick ( July 12, 2017 ). `` Corey Stewart to announce run for U.S. Senate on Thursday, sources say ''. Richmond Times - Dispatch. Retrieved July 12, 2017. ^ Jump up to : `` Running for office ''. June 20, 2017. ^ Jump up to : `` Ron Wallace for U.S. Senate ''. Retrieved July 2, 2017. ^ Jump up to : `` CANTWELL, MARIA - Candidate overview - FEC.gov ''. FEC.gov. ^ Jump up to : `` Search results - FEC.gov ''. FEC.gov. Jump up ^ `` Washington 2017 General Election ''. Thegreenpapers.com. Retrieved 2017 - 08 - 25. ^ Jump up to : Gunderson, Kalea ( May 8, 2017 ). `` Bo Copley explains why he chose to run for US Senate ''. WCHS TV.com. Retrieved July 1, 2017. ^ Jump up to : Attorney General Morrisey announces run for US Senate seat Jump up ^ ( 1 ) ^ Jump up to : Jenkins, Evan ( May 8, 2017 ). `` Jenkins to challenge Manchin for U.S. Senate seat ''. Retrieved May 8, 2017. ^ Jump up to : Cheney, Kyle ( April 19, 2015 ). `` Joe Manchin wo n't run for West Virginia governor ''. Politico. Retrieved April 20, 2015. ^ Jump up to : `` Patrick Morrisey announces U.S. Senate bid in West Virginia ''. Washingtontimes.com. 2017 - 07 - 10. Retrieved 2017 - 08 - 25. Jump up ^ Swearengin, Paula ( May 8, 2017 ). `` Paula Jean for U.S. Senate, West Virginia ''. Retrieved May 8, 2017. ^ Jump up to : `` U.S. Senate 2018 - Status of Incumbents -- Decision Desk HQ Election 2016 ''. www.decisiondeskhq.com. Retrieved January 12, 2017. ^ Jump up to : Glauber, Bill ( July 26, 2017 ). `` Marine veteran Kevin Nicholson launches GOP Senate Wisconsin bid against Tammy Baldwin ''. Milwaukee Journal Sentinel. Retrieved July 27, 2017. ^ Jump up to : `` SCHIESS, JOHN T - Candidate overview - FEC.gov ''. FEC.gov. ^ Jump up to : Glauber, Bill. `` Leah Vukmir enters Republican U.S. Senate race ''. Milwaukee Journal Sentinel. Retrieved September 7, 2017. ^ Jump up to : `` Mary Jo Walters is running for a U.S. Senate seat in Wisconsin ''. July 22, 2017. Retrieved August 15, 2017. ^ Jump up to : `` BARRASSO, JOHN A - Candidate overview - FEC.gov ''. FEC.gov. Jump up ^ `` Nicolas Tutora US Senate ''. Retrieved August 18, 2017. Jump up ^ `` David 's campaign website ''. Davidforcalifornia.com. Retrieved 2017 - 08 - 25. Jump up ^ ( http : www.fec.gov/fecviewer/CandidateCommitteeDetail.do Details for Candidate ID : S6CA00477 ) Jump up ^ `` Search results - FEC.gov ''. FEC.gov. Jump up ^ `` SCHRADER, STEPHEN JAMES - Candidate overview - FEC.gov ''. FEC.gov. Jump up ^ Perry, Mitch ( October 27, 2015 ). `` BILL NELSON ALL BUT ANNOUNCES 2018 RE-ELECTION BID FOR U.S. SENATE ''. Florida Politics. Retrieved April 26, 2016. Jump up ^ Elias, Dave. `` Scott - Nelson Senate fight could be looming ''. NBC-2.com. Retrieved April 14, 2017. Jump up ^ Myers, George ( December 27, 2015 ). `` Kokomo lawyer forms exploratory committee for 2018 Senate run ''. Kokomo Tribune. Retrieved October 15, 2016. Jump up ^ Ross, Doug ( May 4, 2016 ). `` Attorney wants Donnelly to feel the big Hurt ''. The Times of Northwest Indiana. Retrieved October 15, 2016. Jump up ^ `` FEC form registering Andrew Straw for U.S. Senate '' ( PDF ). Federal Election Commission / Secretary of U.S. Senate. February 22, 2017. Jump up ^ `` GOP Candidate On Why He 's Running For Congress In 8th ''. Journal and Topics Online. Retrieved May 22, 2017. Jump up ^ Blake, Aaron ( November 5, 2014 ). `` Angus King and Joe Manchin are sticking with the Democrats. Because, of course. ''. Washington Post. Retrieved May 28, 2015. Jump up ^ `` Maine became the first state in the country Tuesday to pass ranked choice voting ''. Boston Globe. November 10, 2016. Retrieved November 17, 2016. Jump up ^ `` Maine Supreme Judicial Court rules ranked - choice voting unconstitutional ''. Bangor Daily News. May 23, 2017. Retrieved May 23, 2016. Jump up ^ `` Voter - approved ranked - choice voting stays in effect as repeal bills fail ''. Portland Press Herald. June 28, 2017. Retrieved July 10, 2017. Jump up ^ `` LePage says comment about Senate run a joke ''. WMTW - TV. January 13, 2015. Retrieved June 22, 2015. Jump up ^ Fritze, John ( July 14, 2017 ). `` Ben Cardin raises nearly $1 M for 2018 reelection ''. The Baltimore Sun. Retrieved August 22, 2017. Jump up ^ http://www.freep.com/story/news/local/michigan/2017/09/21/john-james-u-s-senate-debbie-stabenow/689425001/ Jump up ^ http://www.freep.com/story/news/local/michigan/2017/09/20/kid-rock-senate-debbie-stabenow/687263001/ Jump up ^ http://www.detroitnews.com/story/news/politics/2017/05/18/politcal-insider/101815922/ Jump up ^ Erickson, Kurt ; Raasch, Chuck ( July 7, 2017 ). `` GOP state lawmaker planning bid for McCaskill seat ''. St. Louis Post-Dispatch. Retrieved Oct 4, 2017. Jump up ^ Dennison, Mike ( July 31, 2017 ). `` Republican state Auditor Rosendale enters 2018 U.S. Senate race ''. KRTV. Retrieved July 31, 2017. Jump up ^ Staff, NCEC. `` Democrats Likely on Defense in 2018 Senate Race ''. National Committee for an Effective Congress. Retrieved June 9, 2017. Jump up ^ Schneider, Elena ( December 29, 2016 ). `` Heller to run for reelection, not governor, in Nevada ''. POLITICO. Retrieved December 29, 2016. Jump up ^ Richardson, Seth ( May 5, 2016 ). `` Heller leaves possible run for governor open ''. Reno Gazette - Journal. Retrieved November 10, 2016. Jump up ^ `` Gazala, Sarah ''. Retrieved September 29, 2017. Jump up ^ Oppenheimer, Jerry ( January 22, 2017 ). `` Could Caroline Kennedy be the baggage - free Hillary Clinton ? ''. New York Post. Retrieved January 24, 2017. Jump up ^ `` Larry Crim Announces U.S. Senate 2018 Race For Seat Held By Corker ''. chattanoogan.com. Retrieved February 21, 2017. Jump up ^ http://thehill.com/homenews/senate/352533-corker-retiring-in-2018. Retrieved September 26, 2017. Missing or empty title = ( help ) Jump up ^ `` Ted Cruz plans to run for re-election in 2018 ''. CNN. Retrieved November 22, 2016. Jump up ^ `` Texas democrat Beto O'Rourke announces bid to unseat Ted Cruz ''. Business Insider. Associated Press. Retrieved March 31, 2017. Jump up ^ `` Aaron Gwaltney for Senate ''. Retrieved August 18, 2017. Jump up ^ Lederman, Josh ( March 3, 2012 ). `` Hatch will retire in 2018 if he wins reelection ''. The Hill. Jump up ^ Dennis Romboy ( November 6, 2014 ). `` Sen. Orrin Hatch leaves door ajar for run in 2018 ''. Deseret News. Retrieved December 12, 2014. Jump up ^ Tanner, Courtney ( May 3, 2017 ). `` Navajo candidate announces bid as Democrat for Hatch 's seat ''. The Salt Lake Tribune. Retrieved June 13, 2017. Jump up ^ Breiner, Andrew ( June 21, 2017 ). `` Navajo Candidate Drops Out of Race Against Hatch ''. Roll Call. Retrieved June 21, 2017. Jump up ^ Schott, Bryan ( April 12, 2017 ). `` Another Democrat looking to knock off Hatch in 2008 ''. Utah Policy. Retrieved April 12, 2017. Jump up ^ `` Thank You ''. Danny Drew For U.S. Senate. Retrieved October 3, 2017. Jump up ^ Blomquist, Dan and Way, Robert. `` Bernie Sanders files for Democratic ballot in N.H. primary '', Boston Globe ( November 5, 2015 ) : `` When a reporter asked Sanders his party allegiance after he filed, Sanders responded, ' I 'm a Democrat. ' He then called on Buckley, the Democratic chairman, who confirmed the senator 's party allegiance. Sanders added that he would run as a Democrat in any future elections. '' Jump up ^ Joy - Ann Reid ( June 6, 2016 ). `` Meet Al Giordano, the Man Who Wants to Take Bernie Down ''. The Daily Beast. Retrieved June 20, 2016. Jump up ^ Noah Berlatsky ( June 9, 2016 ). `` Could this political gadfly steal Bernie Sanders ' Senate seat ? ''. The Week. Retrieved June 20, 2016. Jump up ^ Clauss, Kyle Scott ( June 8, 2016 ). `` Former Boston Phoenix Reporter Wants to Take Bernie Sanders ' Senate Seat ''. Boston Magazine. Retrieved June 16, 2016. Jump up ^ Giordano, Al ( April 18, 2017 ) `` @ algiordano : I have said many times I am not a candidate for office. I am fighting cancer. Please make room for someone else to run by not mentioning me. '' Twitter.com Jump up ^ Nolan, Jim ( November 17, 2016 ). `` RTD EXCLUSIVE : Tim Kaine says he wo n't run for president in 2020 ''. Richmond Times - Dispatch. Retrieved November 17, 2016. Jump up ^ `` Democrats brace against potential 2018 Senate ' disaster ' ''. Politico. Retrieved November 22, 2016. Jump up ^ `` This resource is currently unavailable ''. Scotternstwv.com. Retrieved 2017 - 08 - 25. Jump up ^ `` 2014 Fall Partisan Primary '' ( PDF ). Wisconsin Elections Commissions. August 12, 2014. Jump up ^ `` Canvass Results for 2014 GENERAL ELECTION '' ( PDF ). Wisconsin Elections Commissions. November 4, 2014. 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Question: how many u s senators are up for reelection in 2018
Answer: 33 of the 100 seats