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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 was once the nation's premier swing state.
Republicans see the Ohio seat as one of their biggest targets next year, but Brown has proven to be an effective candidate adept at winning over Independents and even a slice of conservative-leaning voters.
GOP state Sen. Matt Dolan, who also ran for the US Senate in 2022 but fell short in the Republican primary to now-Sen. JD Vance, is seeking the party's nomination. Businessman Bernie Moreno, another candidate who ran last year, is also in the GOP race.
In July, Ohio Secretary of State Frank LaRose announced that he would also seek the GOP nomination.
Pennsylvania
Democratic Sen. Bob Casey Jr., who was first elected to the upper chamber in 2006, is seeking a fourth term in 2024.
Casey, 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 last year.
David McCormick, who narrowly lost the 2022 Republican Senate primary to Dr. Mehmet Oz, is a potential candidate.
West Virginia
Sen. Joe Manchin has not yet announced his intentions for 2024, but he is likely the only Democrat who can hold the seat in such a challenging state for his party. West Virginia was Trump's second-best performing state in the 2020 election, so Manchin will have to win a lot of ticket-splitters to secure another term in the nation's capital.
That said, he has done it before, winning in 2018 despite Republicans going all-out to defeat him, and a dominant 2012 win when the ticket was led by Barack Obama, who was thoroughly shellacked in the Mountain State by Mitt Romney.
On the Republican side, Gov. Jim Justice jumped into the race in late April, joining Rep. Alex Mooney, who entered the primary last November. The GOP has been ascendant in the Mountain State in recent years, but a primary featuring Justice, Mooney, and any other major entrants could become very negative and in turn boost Manchin.
The GOP has long eyed the seat, but Manchin, a former governor, is known for his strong retail politics — and many Republicans acknowledge that he will be a formidable candidate if he chooses to run next year.
Wisconsin
Sen. Tammy Baldwin announced in April that she will seek a third term in the upper chamber.
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.
Republicans will almost certainly try to field a strong candidate, but Baldwin has been able to navigate the sharp ideological divides in her state in a way that has bedeviled members of both parties.
GOP Reps. Mike Gallagher and Bryan Steil have both indicated that they would not enter the race.
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