Democrats are defending a slim Senate majority. Here's a look at the states where both parties are fighting for control.
The 2024 Senate elections — which will run concurrent with the presidential race — are approaching.
Democrats will have to defend several vulnerable incumbents in swing and GOP-heavy states.
However, the party has held its own in the last three cycles in navigating tough Senate races.
In the 2022 midterm elections, Democrats defied political expectations by holding on to their Senate majority. Every incumbent secured reelection, and then-Pennsylvania Lt. Gov. John Fetterman flipped the seat vacated by retiring Republican Sen. Pat Toomey.
The upper chamber in January 2023 then shifted from its previous 50-50 split — with Senate control in 2021 and 2022 resting on Vice President Kamala Harris' tiebreaking abilities — to a 51-49 majority led by Majority Leader Chuck Schumer of New York. And despite Arizona Sen. Kyrsten Sinema switching from the Democratic Party to register as an Independent late in 2022, she continues to retain her committee assignments through her former party.
However, the class of senators who were elected and reelected in 2018 — a Democratic wave year that saw several vulnerable red-state members of the party change over — will face a challenging map in 2024.
Much of the party's performance will likely be tied to how strongly Harris performs alongside her vice-presidential running mate — Gov. Tim Walz of Minnesota.
President Joe Biden won the overwhelming number of delegates in the 2024 Democratic primaries as he sought reelection to a second term. But Biden stepped aside as the presumptive nominee in July 2024 and threw his support behind Harris to succeed him.
Former President Donald Trump, who will once again be the Republican presidential nominee this year, remains unpopular among moderates who often decide close Senate elections.
Sen. Joe Manchin of West Virginia announced he wouldn't seek reelection in 2024, a major blow to Democrats as he was not only the lone statewide officeholder from the party but the only Democrat who could conceivably have run a competitive race given its conservative lean. The GOP is now in the driver's seat in the Mountain State, which backed Trump over Biden by 39 points in 2020.
In 2024, a total of 34 seats will be up for grabs, including 20 held by Democrats, 11 held by Republicans, and three held by Independents.
Here are the key states that both parties are set to target:
Arizona
Sinema's decision to become an Independent gave Democrats jitters while they were still rejoicing Georgia Sen. Raphael Warnock's runoff victory in December 2022, but since then, her decision hasn't impaired the party's ability to move legislation and approve judicial nominations.
However, after more than a year of speculation, Sinema announced in March 2024 that she wouldn't seek reelection to a second term, ending fears from some Democrats that her candidacy might aid the GOP in a potential three-way race.
Rep. Ruben Gallego ran unopposed in the July 2024 Democratic primary. Democrats have made major inroads in Arizona in recent years, and the party is aiming to bolster their political ascent in the state by electing Gallego.
On the Republican side, former television journalist Kari Lake defeated Pinal County Sheriff Mark Lamb and Elizabeth Reye.
Lake, the 2022 gubernatorial nominee who lost to now-Gov. Katie Hobbs, jumped into the Senate race in October 2023 with the endorsement of Trump. While Lake ran a hard-charging conservative campaign two years ago, she has recalibrated her strategy and is aiming to expand the GOP tent this year in anticipation of a competitive general election race in the purple state.
Maryland
Former Republican Gov. Larry Hogan will face off against Prince George's County Executive Angela Alsobrooks for the seat being vacated by veteran Democratic Sen. Ben Cardin.
Maryland is one of the most Democratic states in the country. The party has hefty majorities in the state legislature and dominates the state's congressional delegation. In the 2020 election, Biden won the state by 33 points. And Gov. Wes Moore easily won the state's open gubernatorial race in 2022.
Hogan's candidacy presents a unique challenge for Democrats. The former two-term governor, one of the most prominent Republican critics of Trump, left office with high marks from Maryland voters. During his two gubernatorial runs, he won over many moderate Democrats and Independents en route to his victories in a state where Republicans are vastly outnumbered.
And Republicans have the financial means to compete in Maryland as they seek to replicate the coalition that gave Hogan eight years in Annapolis.
But Alsobrooks, a former prosecutor, gained substantial name recognition as she campaigned across the state and won a tough Democratic primary against Rep. David Trone, who spent over $60 million of his own money in his unsuccessful bid to secure the party's nomination.
Alsobrooks also benefits from representing the state's second-most populous county, and in the primary she performed strongly in Trone's suburban Washington backyard and in the Baltimore area.
If elected, Alsobrooks would be Maryland's first Black US senator.
In June 2024, Trump threw his support behind Hogan's candidacy in an attempt to bridge GOP divides ahead of the critical summer stretch.
But Hogan's campaign is maintaining its distance from Trump.
"Governor Hogan has been clear he is not supporting Donald Trump just as he didn't in 2016 and 2020," a Hogan campaign spokesperson said in a statement at the time.
Alsobrooks is using Trump's show of support for Hogan to tie the Senate candidate to conservative efforts to curtail abortion rights.
But Hogan has said that he would not vote for a national abortion ban. It's a stance that Democrats continue to question on the campaign trail.
"Republicans see Hogan as a ticket to a national abortion ban," Alsobrooks said during a Baltimore news conference in May 2024. "They believe that road runs through Larry Hogan and runs through the state of Maryland."
Michigan
Democratic Sen. Debbie Stabenow, a popular lawmaker now in her fourth term, announced in January 2023 that she would not run for reelection in 2024.
Stabenow, the chair of the Senate Agriculture Committee, was most recently reelected in 2018 by 6.5% against now-GOP Rep. John James. (James, the Republican Senate nominee in both 2018 and 2020, is running for reelection to his House seat anchored in suburban Detroit this fall.)
Republicans would very much like to flip this seat, but Michigan Democrats had a banner year in November 2022 — sweeping the top statewide offices and retaking control of the full legislature. Michigan is a must-win state for Democrats this year, but he continues to face significant intraparty pushback over the conflict in Gaza, an issue that will play heavily in the presidential race and the Senate contest given the state's sizable Arab-American population.
Rep. Elissa Slotkin, a moderate Democrat who represents a Lansing-area swing district that stretches to rural and suburban areas northwest of Detroit, won the party's Senate nomination after defeating the actor Hill Harper in an August 2024 primary. Harper, best known for his roles on "CSI: NY" and "The Good Doctor," supported a permanent cease-fire in Gaza and sought to position himself as a stronger ally of organized labor.
Gov. Gretchen Whitmer, Lt. Gov. Garlin Gilchrist II, Michigan Attorney General Dana Nessel, Michigan Secretary of State Jocelyn Benson, Reps. Debbie Dingell and Haley Stevens, and state Sen. Mallory McMorrow all previously ruled out Senate campaigns.
Former Rep. Mike Rogers, who once chaired the House Intelligence Committee, easily won the Republican Senate primary over former Rep. Justin Amash and physician Sherry O'Donnell.
Ex-Rep. Peter Meijer, one of 10 House Republicans who voted to impeach Trump for his role on January 6, 2021, entered the GOP primary in November 2023 but withdrew in April 2024.
Meijer served for one term in Congress and was ousted in a 2022 GOP primary by Trump-backed challenger John Gibbs. Gibbs eventually lost the general election race to now-Democratic Rep. Hillary Scholten.
Montana
Democratic Sen. Jon Tester is a political survivor, having first won in conservative-leaning Montana in 2006 before winning tough reelection contests in 2012 and 2018.
And Tester hopes to keep the streak going, announcing in February 2023 that he'd seek a fourth Senate term in 2024.
Despite the GOP lean of Montana, Tester has built a solid political brand over the years and has been able to appeal to many of the state's Independents and Republicans in past elections. GOP leaders have long coveted this seat, though.
Former Navy SEAL Tim Sheehy, a favorite of Republican leaders in Washington, was endorsed by Trump and won the June 2024 GOP primary.
Rep. Matt Rosendale, a staunch conservative who lost to Tester in 2018, entered the race in February 2024. But the following week, Rosendale dropped his bid, citing the headwinds he'd likely face after Trump backed Sheehy.
After Rosendale pivoted to running for reelection to the House, he subsequently withdrew from that race as well.
Nevada
Democratic Sen. Jacky Rosen is running for a second term in office in one of the most competitive battleground states in the country. In 2018, Rosen, then a first-term congresswoman, ousted then-Republican Sen. Dean Heller by 5 points.
In 2024, Rosen will be running for reelection to a second term.
Army veteran and businessman Sam Brown easily won the June 2024 GOP Senate primary against a slate of candidates that included Jeffrey Gunter, the former US ambassador to Iceland, as well as former state lawmaker Jim Marchant.
Ohio
Sherrod Brown, who was also elected to the Senate in 2006, is running for a fourth term. He has maintained a strong populist connection with his constituents despite the continued reddening of Ohio, which only 20 years ago was widely seen as the nation's premier swing state.
Republicans view the Ohio seat as one of their biggest targets, but Brown has proven to be an effective candidate adept at winning over Independents and even a slice of conservative-leaning voters.
In March 2024, businessman Bernie Moreno defeated state Sen. Matt Dolan and Ohio Secretary of State Frank LaRose in a hotly-contested GOP primary.
Moreno and Dolan previously ran for Senate in 2022 but fell short in that year's Republican primary to now-Sen. JD Vance.
The general election matchup between Brown and Moreno, which could very well determine the Senate majority, is now set to be one of the most expensive races in the country.
Pennsylvania
Democratic Sen. Bob Casey Jr., who was first elected to the upper chamber in 2006, is seeking a fourth term in 2024.
Casey — a former Pennsylvania auditor general and ex-state treasurer who has won all three of his prior Senate races with relative ease — will likely benefit from running in a presidential year when turnout in the Democratic strongholds of Philadelphia and Pittsburgh is poised to be very high.
However, Casey has also generally done well in many of the state's working-class towns and cities, and he could post an electoral performance similar to Fetterman, who dominated in the vote-rich Philadelphia suburbs in 2022.
David McCormick, a businessman who narrowly lost the 2022 Republican Senate primary to Dr. Mehmet Oz, will be the party's Senate nominee in the fall. McCormick, who grew up in the Pittsburgh area, is viewed as a candidate who can potentially bolster the GOP among Independents and suburban voters.
Texas
The Lone Star State has been firmly in the Republican column since the 1990s.
Democrats have sought to run more competitive Senate and gubernatorial races in recent years but have largely fallen short by sizable margins, with the notable exception being the close 2018 senatorial contest between then-Democratic Rep. Beto O'Rourke and Republican Sen. Ted Cruz. That year, O'Rourke lost to Cruz by 2.6 points, a result that gave Democrats hope that they could once again win the state in the near future.
Cruz has long been a political foil for Democrats; the conservative lawmaker also ran for president in 2016 before his defeat in the GOP primary to Trump.
In March 2024, Rep. Colin Allred, a former NFL player and civil rights attorney, easily won the Democratic primary over candidates that included state Sen. Roland Gutierrez, state Rep. Carl Sherman, and former Nueces County district attorney Mark Gonzalez.
Republicans point to the conservative tilt of the state in projecting confidence in the race, but they are also cognizant of Cruz's narrow 2018 victory.
Trump is favored to carry Texas in 2024, which would likely boost Cruz, but Allred was first elected to office by appealing to moderates and flipping a GOP-held district in the Dallas area. The congressman could potentially build on O'Rourke's success by making further inroads in suburbs across the state, especially as abortion remains as potent an issue in 2024 as it was in the 2022 and 2023 elections.
Wisconsin
Sen. Tammy Baldwin in August 2024 won the Democratic primary in her bid for a third term.
While Wisconsin in recent years has been one of the most politically polarized states in the country, Baldwin was able to win over many rural and exurban voters during her 2012 and 2018 campaigns — while also racking up large margins in the Democratic-heavy population centers of Milwaukee and Madison.
Businessman Eric Hovde won the GOP primary, defeating construction worker Charles Barman and Rejani Raveendran, the chair of the University of Wisconsin-Stevens Point College Republicans.
Several of the most prominent Republicans who were thought of as potential candidates — including former Gov. Scott Walker, Reps. Bryan Steil and Tom Tiffany, and former Rep. Mike Gallagher — declined to enter the race.
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