The 2024 Senate elections are fast approaching. These are the seats up for re-election.

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Corrections & Clarifications: The story has been updated to correct David Trone's time of service as a member of the U.S. House of Representatives. 

The 2024 presidential campaign is already well underway, but ballots across the country are long, and commander in chief isn't the only position in play.

There are 33 United States senators up for re-election in 2024. Ten are Republicans, three are Independents, and 20 are Democrats.

The upper chamber, which is now controlled narrowly by Democrats, could flip red if the GOP performs well next November. The map is considered to favor Republicans slightly this election cycle, though electoral predictions will continue to evolve, and surprises on the campaign trail are always possible.

Come decision day 2024, these are the states that will see contests for senator, and who currently represents them.

Which senators are up for reelection in 2024?

Arizona

Sen. Kyrsten Sinema, I-Ariz., questions the witnesses during a Senate Banking, Housing, and Urban Affairs hearing examining the failures of Silicon Valley Bank and Signature Bank, Tuesday, May 16, 2023, on Capitol Hill in Washington.
Sen. Kyrsten Sinema, I-Ariz., questions the witnesses during a Senate Banking, Housing, and Urban Affairs hearing examining the failures of Silicon Valley Bank and Signature Bank, Tuesday, May 16, 2023, on Capitol Hill in Washington.

Kyrsten Sinema

Party: Independent

Sinema, once a Democrat, is known for her eccentric fashion choices and her centrist views, which have regularly held up the Democratic policy agenda. Sinema, who left the Democratic Party in December 2022, citing concerns over "rigid partisanship," will be challenged from the left by current Rep. Ruben Gallego, D-Ariz.

California

Sen. Dianne Feinstein, D-Calif., returns to the Senate Judiciary Committee following a more than two-month absence at the Capitol in Washington, Thursday, May 11, 2023.
Sen. Dianne Feinstein, D-Calif., returns to the Senate Judiciary Committee following a more than two-month absence at the Capitol in Washington, Thursday, May 11, 2023.

Dianne Feinstein

Party: Democratic

Feinstein is a veteran of the Senate whose age has come into play as a prominent political concern. Earlier this year she was absent from the chamber for over two months, recovering from a case of shingles. Her absence brought important committee votes to a standstill and led some to call for her resignation.

She will not seek another term, and the race for her seat is expected to be highly competitive with heavy hitters from the Democratic Party, such as Democratic Reps. Barbara Lee, Adam Schiff and Katie Porter vying for her spot.

Connecticut

In this file photo taken on April 04, 2019 US Senator Chris Murphy (2nd L), Democrat from Connecticut, speaks alongside US Senator Bernie Sanders (L), an Independent from Vermont, US Representative Ro Khanna (2nd R), Democrat of California, and US Representative Jim McGovern (R), Democrat of Massachusetts, during a press conference following a vote in the US House on ending US military involvement in the war in Yemen, on Capitol Hill in Washington, DC.

Chris Murphy

Party: Democratic

Murphy has served as the senator from Connecticut since 2013 and is expected to cruise to re-election in 2024 in predominantly blue Connecticut. During his time in the chamber, he has made gun control a major issue, often referencing the 2012 Sandy Hook school shooting in his home state.

Delaware

Senator Tom Carper, D-Delaware, right, speaks with John F. Kelly, nominee for Secretary of Homeland Security, before confirmation hearing before the Senate Homeland Security and Governmental Affairs Committee.
Senator Tom Carper, D-Delaware, right, speaks with John F. Kelly, nominee for Secretary of Homeland Security, before confirmation hearing before the Senate Homeland Security and Governmental Affairs Committee.

Tom Carper

Party: Democratic

Carper, who originally won his seat in 2000, will not seek another term. In his retirement announcement, Carper endorsed Rep. Lisa Blunt Rochester to be his successor. Blunt Rochester formally announced her candidacy in June.

Florida

Sen. Rick Scott (R-FL) speaks on border security and Title 42 during a press conference at the U.S. Capitol on May 11, 2023 in Washington, DC.
Sen. Rick Scott (R-FL) speaks on border security and Title 42 during a press conference at the U.S. Capitol on May 11, 2023 in Washington, DC.

Rick Scott

Party: Republican

Scott has been a senator since 2019, and he served as state governor before his time in the upper chamber. Scott is a vocal supporter of former President Donald Trump and was tasked as chair of the National Republican Senatorial Committee with securing a victory for the party in the midterms.

Hawaii

Sen. Mazie Hirono, D-Hawaii, questions Supreme Court nominee Ketanji Brown Jackson during her Senate Judiciary Committee confirmation hearing on Capitol Hill in Washington, Tuesday, March 22, 2022.
Sen. Mazie Hirono, D-Hawaii, questions Supreme Court nominee Ketanji Brown Jackson during her Senate Judiciary Committee confirmation hearing on Capitol Hill in Washington, Tuesday, March 22, 2022.

Mazie Hirono

Party: Democratic

Hirono was the first Asian American woman to be elected a U.S. senator. She first won her seat in 2012 and has spent much of her tenure in the chamber working on legislation addressing immigration, the environment and veterans affairs.

Indiana

Senator Mike Braun (R-IN) speaks to guests at the 2023 NRA-ILA Leadership Forum on April 14, 2023 in Indianapolis, Indiana.
Senator Mike Braun (R-IN) speaks to guests at the 2023 NRA-ILA Leadership Forum on April 14, 2023 in Indianapolis, Indiana.

Mike Braun

Party: Republican

Braun, who won his Senate seat in 2018, is opting to run for governor in his state rather than seek a second term. Braun is not the only Republican seeking the governorship. Among others, he will have to run against Lt. Gov. Suzanne Crouch. The race to replace Braun is expected to become crowded, with plenty of rising GOP stars hoping to toss their hat in the ring.

Maine

Sen. Angus King, I-Maine, walks to the Senate chamber on Capitol Hill in Washington, Tuesday, Jan. 21, 2020.
Sen. Angus King, I-Maine, walks to the Senate chamber on Capitol Hill in Washington, Tuesday, Jan. 21, 2020.

Angus King

Party: Independent

King has not yet announced his 2024 reelection bid but appears to be gearing up for another run. One of just three independents in the Senate, he has held the seat since 2013.

Maryland

Vice President Joe Biden, left, gets a tour of a MARC train station with Sen. Benjamin Cardin, D-Md., before Biden spoke about transportation, Thursday, Feb. 5, 2009, in Laurel, Md.
Vice President Joe Biden, left, gets a tour of a MARC train station with Sen. Benjamin Cardin, D-Md., before Biden spoke about transportation, Thursday, Feb. 5, 2009, in Laurel, Md.

Ben Cardin

Party: Democratic

Cardin, who has been in office since 2007, announced in May he would not seek re-election. Since the announcement, a slew of candidates have indicated they plan to run in the Democratic primary in Maryland, including Prince George's County Executive Angela Alsobrooks, U.S. Rep. David Trone and Montgomery County Councilmember Will Jawando.

Massachusetts

Sen. Elizabeth Warren (D-MA) speaks during a Senate Banking Committee hearing on Capitol Hill on June 13, 2023 in Washington, DC.
Sen. Elizabeth Warren (D-MA) speaks during a Senate Banking Committee hearing on Capitol Hill on June 13, 2023 in Washington, DC.

Elizabeth Warren

Party: Democratic

One-time presidential hopeful and Senate veteran Elizabeth Warren is running to keep her seat in 2024. She has served as senator for ten years and is unlikely to face a strong primary challenger.

Michigan

Sen. Debbie Stabenow, D-Mich., center, speaks to reporters after a news conference Wednesday, May 31, 2023, on Capitol Hill in Washington.
Sen. Debbie Stabenow, D-Mich., center, speaks to reporters after a news conference Wednesday, May 31, 2023, on Capitol Hill in Washington.

Debbie Stabenow

Party: Democratic

Stabenow, who has been in the Senate since 2001, announced plans to retire in early January, opening up a seat in a critical battleground state. In the Democratic primary to replace her, Rep. Elissa Slotkin is widely considered the frontrunner, though former state Rep. Leslie Love and businessman Nasser Beydoun have also declared candidacies. On the Republican side, businessman Michael Hoover and State Board of Education member Nikki Snyder have announced plans to run.

Minnesota

Sen. Amy Klobuchar, D-Minn., speaks as Sen. Debbie Stabenow, D-Mich., right, listens during a news conference after a policy luncheon Wednesday, May 31, 2023, on Capitol Hill in Washington.
Sen. Amy Klobuchar, D-Minn., speaks as Sen. Debbie Stabenow, D-Mich., right, listens during a news conference after a policy luncheon Wednesday, May 31, 2023, on Capitol Hill in Washington.

Amy Klobuchar

Party: Democratic

Klobuchar, who rose to national fame during her 2020 bid for the presidency, has been a Minnesota senator since 2007 and is the first woman to be elected by the state to the Senate.

Mississippi

Sen. Roger Wicker (R-MS) speaks on border security and Title 42 during a press conference at the U.S. Capitol on May 11, 2023 in Washington, DC.
Sen. Roger Wicker (R-MS) speaks on border security and Title 42 during a press conference at the U.S. Capitol on May 11, 2023 in Washington, DC.

Roger Wicker

Party: Republican

Wicker has been the state's senator since 2007 and will run again in 2024. He serves as the ranking member on the Senate Armed Services Committee.

Missouri

Sen. Josh Hawley, R-Mo., walks at the Capitol in Washington, Nov. 16, 2022.
Sen. Josh Hawley, R-Mo., walks at the Capitol in Washington, Nov. 16, 2022.

Josh Hawley

Party: Republican

Famous in part for holding up a fist in support of rioters outside the capitol on Jan. 6, 2021, Hawley forms part of a growing conservative flank of the GOP. He will run for re-election in 2024 and be challenged on the left by both St. Louis County Prosecutor Wesley Bell and Maine Corps veteran Lucas Kunce.

Montana

Sen. Jon Tester, D-Mont., chairman of the Senate Committee on Veterans' Affairs, speaks with reporters before meeting with the Senate Democratic Caucus, at the Capitol in Washington, Tuesday, June 13, 2023.
Sen. Jon Tester, D-Mont., chairman of the Senate Committee on Veterans' Affairs, speaks with reporters before meeting with the Senate Democratic Caucus, at the Capitol in Washington, Tuesday, June 13, 2023.

Jon Tester

Party: Democratic

A Democrat in a deeply red state, Tester has held his Senate seat since 2007. He is expected to face a tough challenge from the right in 2024 as Republicans battle to regain a majority in the U.S. Senate. Among the names being floated as potential challengers are U.S. Rep. Matthew M. Rosendale, who lost to Tester in 2018, and Tim Sheehy, a businessman and veteran.

Nebraska

Sen. Deb Fischer, R-Neb., speaks during an unveiling ceremony for the Congressional statue of Willa Cather, in Statuary Hall on Capitol Hill in Washington, Wednesday, June 7, 2023.
Sen. Deb Fischer, R-Neb., speaks during an unveiling ceremony for the Congressional statue of Willa Cather, in Statuary Hall on Capitol Hill in Washington, Wednesday, June 7, 2023.

Deb Fischer

Party: Republican

Fischer has represented Nebraska in the Senate since the 2012 midterms and has already announced her plans to seek reelection. The move makes it less likely for another Republican to throw their hat in the ring, though some speculated Republican Gov. Pete Ricketts was weighing a run.

Nevada

U.S. Sen. Jacky Rosen (D-NV) walks off the Senate subway at the U.S. Capitol on May 02, 2023 in Washington, DC.
U.S. Sen. Jacky Rosen (D-NV) walks off the Senate subway at the U.S. Capitol on May 02, 2023 in Washington, DC.

Jacky Rosen

Party: Democratic

Rosen, who has already announced her reelection bid for 2024, has held her seat since 2019. Nevada is a fiercely divided state and forms part of a challenging electoral map for Democrats. Though no Republicans have yet announced their candidacy, Rosen is expected to have to defend her seat from a strong challenger.

New Jersey

Robert Menendez

Party: Democratic

Menendez has held his Senate seat since 2006 and intends to run again but is facing, along with his wife, a broad federal investigation centered in part on undisclosed gifts the senator received, the Washington Post reported.

New Mexico

Sen. Martin Heinrich (D-NM) sits in a Monarch MK-V Electric Tractor during an event showcasing various electric trucks near Capitol Hill on June 7, 2023 in Washington, DC.
Sen. Martin Heinrich (D-NM) sits in a Monarch MK-V Electric Tractor during an event showcasing various electric trucks near Capitol Hill on June 7, 2023 in Washington, DC.

Martin Heinrich

Party: Democratic

Heinrich, who has held his seat since 2013, will run again in 2024. He launched his campaign for a third term with a video touching on gun safety and the importance of a transition to clean energy. Republicans have not yet announced a challenger.

New York

Sen. Kirsten Gillibrand, D-N.Y., asks a question during a Senate Special Committee on Aging hearing, Thursday, May 18, 2023, on Capitol Hill in Washington.
Sen. Kirsten Gillibrand, D-N.Y., asks a question during a Senate Special Committee on Aging hearing, Thursday, May 18, 2023, on Capitol Hill in Washington.

Kirsten Gillibrand

Party: Democratic

Gillibrand has become a mainstay of New York politics, holding her Senate seat since 2009. This primary season she will face a challenge from Army veteran William Schweitzer, who once worked in Sen. Chuck Schumer’s Rochester district office and served as deputy press secretary during ex-Gov. Andrew Cuomo’s 2018 reelection campaign. Though speculation swirled over whether Gillibrand would face more challenges from up-and-coming New York lawmakers, no other candidates have yet been announced.

North Dakota

Sen. Kevin Cramer, R-N.D., speaks to reporters on Capitol Hill in Washington, Saturday, Feb. 13, 2021, on the fifth day of the second impeachment trial of former President Donald Trump.
Sen. Kevin Cramer, R-N.D., speaks to reporters on Capitol Hill in Washington, Saturday, Feb. 13, 2021, on the fifth day of the second impeachment trial of former President Donald Trump.

Kevin Cramer

Party: Republican

Cramer, who won his seat in 2018, has not yet announced plans to seek reelection. Cramer was a close ally of Trump during the former president's term in office, but has since voiced support for a possible replacement on the 2024 GOP ticket.

Ohio

US Senator Sherrod Brown (D-OH) speaks during a Senate Banking, Housing, and Urban Affairs hearing on the failures of Silicon Valley Bank and Signature Bank, on Capitol Hill in Washington, DC, on May 16, 2023.
US Senator Sherrod Brown (D-OH) speaks during a Senate Banking, Housing, and Urban Affairs hearing on the failures of Silicon Valley Bank and Signature Bank, on Capitol Hill in Washington, DC, on May 16, 2023.

Sherrod Brown

Party: Democratic

Brown is a prominent target for Republicans in 2024. He occupies a swing state seat they see as a possible pick-up in their quest to regain control of the chamber. An ad blitz has already begun in the state as GOP challengers attempt to oust Brown, who first won the election in 2006. Republican state Sen. Matt Dolan has already announced a run along with businessman Bernie Moreno, and GOP Secretary of State Frank LaRose is also rumored to be considering a run.

Pennsylvania

Sen. Robert Casey Jr., D-Pa., speaks at the Democratic National Convention in Denver, Tuesday, Aug. 26, 2008.
Sen. Robert Casey Jr., D-Pa., speaks at the Democratic National Convention in Denver, Tuesday, Aug. 26, 2008.

Bob Casey

Party: Democratic

Casey was first elected in 2006. Though he represents a swing state identified by Republicans as an ideal win in 2024, he is considered a tough candidate to beat. The son of former Gov. Robert Casey, Sr. he is widely popular in the state, especially with swaths of voters other Democrats have begun to struggle with attracting. The GOP is expected to run former business executive David McCormick, though he has not yet announced.

Rhode Island

Sen. Sheldon Whitehouse, D-R.I., questions Martha Williams, director of the U.S. Fish and Wildlife Service, as she testifies before the Senate Environment and Public Works Committee on President's proposed budget request for fiscal year 2024 for her agency, at the Capitol in Washington, Tuesday, May 16, 2023.
Sen. Sheldon Whitehouse, D-R.I., questions Martha Williams, director of the U.S. Fish and Wildlife Service, as she testifies before the Senate Environment and Public Works Committee on President's proposed budget request for fiscal year 2024 for her agency, at the Capitol in Washington, Tuesday, May 16, 2023.

Sheldon Whitehouse

Party: Democratic

Whitehouse, who has been in the Senate for a little under a decade, is running for a fourth term. He will face a challenge on the right from Raymond McKay, a veteran and former president of the Rhode Island Republican Assembly.

Tennessee

Marsha Blackburn

Party: Republican

Elected in 2018, Blackburn has become a prominent voice among conservatives, particularly on culture war issues. She has announced plans to seek reelection, but will face a prominent challenge on the left.

State Rep. Gloria Johnson, who entered the national spotlight when she was nearly expelled from the state legislature for holding a protest on the House floor against gun violence, will run. Two of her colleagues, Democratic Reps. Justin Jones of Nashville and Justin Pearson of Memphis were briefly expelled for the same action. Joining her in the primary is Marquita Bradshaw, an activist for environmental justice who mounted an unsuccessful bid for Senate in 2020.

Nashville attorney Joanne Sowell, another Democrat, has already filed her candidacy with the FEC.

Texas

Sen. Ted Cruz, R-Texas, defends former President Donald Trump while telling reporters President Joe Biden should be indicted, at the Capitol in Washington, Tuesday, June 13, 2023.
Sen. Ted Cruz, R-Texas, defends former President Donald Trump while telling reporters President Joe Biden should be indicted, at the Capitol in Washington, Tuesday, June 13, 2023.

Ted Cruz

Party: Republican

Cruz, a political firebrand for his party and a two-time presidential candidate, successfully battled off a challenge from Democratic candidate Beto O'Rourke in 2018. For 2024, he may have to do the same. Democratic Rep. Colin Allred, and state Sen. Roland Gutierrez, are both running for the with hopes of unseating Cruz.

Utah

U.S. Sen. Mitt Romney (R-UT) leaves a Republican policy luncheon at the U.S. Capitol on May 31, 2023 in Washington, DC.
U.S. Sen. Mitt Romney (R-UT) leaves a Republican policy luncheon at the U.S. Capitol on May 31, 2023 in Washington, DC.

Mitt Romney

Party: Republican

One-time presidential nominee for the GOP, Romney has come to occupy a minority in recent years, treading a more centrist, anti-Trump line. He has held his Senate seat since 2019, serving before that as Governor of Massachusetts.

Vermont

Sen. Bernie Sanders, I-Vt., chairman of the Senate Health, Education, Labor and Pensions Committee, listens during a hearing on Capitol Hill on June 8, 2023.
Sen. Bernie Sanders, I-Vt., chairman of the Senate Health, Education, Labor and Pensions Committee, listens during a hearing on Capitol Hill on June 8, 2023.

Bernie Sanders

Party: Independent

Sanders, a famously outspoken member of the Senate's left flank, has been in office since 2007. He is one of the chamber's few independents but often votes on a party line with Democrats. Sanders, who famously energized a grass-roots movement during his 2016 and 2020 presidential runs, has ruled out a 2024 bid, saying instead he would endorse Biden.

Virginia

Sen. Tim Kaine, D-Va.. speaks during the Senate Health, Education, Labor, and Pensions Committee hearing on Why Are So Many American Youth in a Mental Health Crisis? Exploring Causes and Solutions, on Capitol Hill in Washington, Thursday, June 8, 2023.
Sen. Tim Kaine, D-Va.. speaks during the Senate Health, Education, Labor, and Pensions Committee hearing on Why Are So Many American Youth in a Mental Health Crisis? Exploring Causes and Solutions, on Capitol Hill in Washington, Thursday, June 8, 2023.

Tim Kaine

Party: Democratic

Kaine, who was the vice presidential candidate on Hillary Clinton's ticket in 2016, has represented Virginia in the Senate since 2013. For Democrats who face a tough electoral map in 2024, his race is a must-win. Though Kaine is a veteran of Virginia politics, and the state tends to lean blue, Republican Gov. Glenn Youngkin's win in 2021 proved a red tilt is not far off.

Eddie Garcia, a military veteran, has already announced he will seek the GOP nomination in the Senate race.

Washington

Sen. Maria Cantwell, D-Wash., speaks at a roundtable discussion hosted by J.P. Morgan Chase & Co. where members of Congress and JPMorgan Chase representatives discuss boosting small business growth and job creation on Tuesday, July 22, 2014 in Washington, DC.
Sen. Maria Cantwell, D-Wash., speaks at a roundtable discussion hosted by J.P. Morgan Chase & Co. where members of Congress and JPMorgan Chase representatives discuss boosting small business growth and job creation on Tuesday, July 22, 2014 in Washington, DC.

Maria Cantwell

Party: Democratic

Cantwell has been in the Senate for over two decades, first winning election in 2000. Cantwell has yet to announce plans to seek re-election but is expected to. No GOP candidates have thrown their hats in the ring so far.

West Virginia

Sen. Joe Manchin, D-W.Va., chairman of the Senate Energy and Natural Resources Committee, speaks to a colleague just outside the chamber, at the Capitol in Washington, Tuesday, June 13, 2023.
Sen. Joe Manchin, D-W.Va., chairman of the Senate Energy and Natural Resources Committee, speaks to a colleague just outside the chamber, at the Capitol in Washington, Tuesday, June 13, 2023.

Joe Manchin

Party: Democratic

Manchin, a notoriously centrist vote on the Democratic side, has not yet announced a 2024 re-election bid. Rumors have swirled that the West Virginia political titan is weighing a possible third-party run for president. Potential presidential bid aside, Manchin is one of his party's most vulnerable incumbents.

The GOP primary in West Virginia is already shaping up with Gov. Jim Justice, a former Democrat who swapped parties in 2017, jumping in the race on the establishment side, and Rep. Alex Mooney, who belongs to the hyper-conservative House Freedom Caucus running, to his right.

Wisconsin

Sen. Tammy Baldwin, D-Wis., speaks during a Senate Health, Education, Labor and Pensions confirmation hearing for Julie Su to be the Labor Secretary, on Capitol Hill, Thursday, April 20, 2023, in Washington.
Sen. Tammy Baldwin, D-Wis., speaks during a Senate Health, Education, Labor and Pensions confirmation hearing for Julie Su to be the Labor Secretary, on Capitol Hill, Thursday, April 20, 2023, in Washington.

Tammy Baldwin

Party: Democratic

Baldwin, who announced plans for re-election in April, is a prime target for the GOP this election cycle. Though no Republican has yet formally announced their candidacy, behind the scenes plenty of names are being floated.

"I don’t think anybody’s fairly concerned about the timing yet," Mark Jefferson, executive director of the Republican Party of Wisconsin, told the Milwaukee Journal Sentinel, part of the USA TODAY network "And we have some strong candidates looking at it.”

Wyoming

Sen. John Barrasso, R-Wyo., speaks during a Senate Energy and Natural Resources hearing to examine the federal response to escalating wildfires and to evaluate reforms to land management and wildland firefighter recruitment, Thursday, June 8, 2023, on Capitol Hill in Washington.
Sen. John Barrasso, R-Wyo., speaks during a Senate Energy and Natural Resources hearing to examine the federal response to escalating wildfires and to evaluate reforms to land management and wildland firefighter recruitment, Thursday, June 8, 2023, on Capitol Hill in Washington.

John Barrasso

Party: Republican

Barrasso has represented Wyoming in the Senate since 2007. In one of the reddest states in the country, he has not yet formally announced his candidacy but is unlikely to face a strong Democratic challenger.

This article originally appeared on USA TODAY: What senators are up for re-election in 2024? State races to watch