The Cook Political Report released its first predictions for the 2024 election season, dropping new Senate ratings that do not look promising for several members of the Democratic Party while most GOP seats are expected to remain red.

The election analysis considers three Democratic seats to be "toss-ups" – held by Sen. Kyrsten Sinema, I-Ariz., Sen. Joe Manchin, D-W.Va., and Sen. Sherrod Brown, D-Ohio – all in states that former President Donald Trump won in the 2020 presidential election.

Brown is the only "toss-up" to already announce a run for re-election next cycle. The Democrat, who revealed in November that he would be seeking re-election in the Buckeye State, has survived three terms in the Senate, even as past elections indicate Ohio voters are moving to the right.

Sinema recently exited the Democratic Party to register as an independent, a move that potentially opened the door for opposition from both the right and the left if the senator decides to seek another term. While Sinema has not announced her re-election plans, Democratic contenders are already entering the battle for her seat. 

2024 BATTLE FOR THE SENATE HEATS UP AS REPUBLICANS EYE DEMOCRATS' MAJORITY

Tester Sinema Brown Manchin

The most vulnerable Democratic senators in 2024 are, from left, Jon Tester of Montana, Kyrsten Sinema of Arizona, Sherrod Brown of Ohio, and Joe Manchin of West Virginia. (Getty Images)

Manchin recently introduced the Democrats' major spending package, the Inflation Reduction Act, alongside Senate Majority Leader Chuck Schumer, D-N.Y. According to a study by the University of Pennsylvania Penn Wharton, the bill will only reduce annual inflation by 0.1 percentage points over the next five years.

"West Virginians made it overwhelmingly clear they reject Joe Biden and his far-left agenda, but Joe Manchin sold them out when he led the way on Biden’s anti-coal, green energy boondoggle," the National Republican Senatorial Committee (NRSC) spokesman Philip Letsou said in statement regarding Manchin's re-election chances. "Joe Manchin has a simple choice: retire now or get fired in 2024."

Of the Republicans with terms ending in 2025, none are considered to be toss-ups according to CPR's ratings.

Florida Senator Rick Scott

Sen. Rick Scott was the only Republican up for re-election whose seat isn't considered "lean Republican." (Lev Radin)

Among the 10 GOP senators whose terms end in 2025, only one seat was not considered solid Republican – the one held by Sen. Rick Scott, of Florida, whose election was marked as likely Republican.

THESE SENATORS FACE THE MOST TROUBLE GETTING RE-ELECTION IN 2024

Manchin was the sole Democratic senator on the vulnerable list of seats leaning toward a Republican flip.

Arizona Sen. Kyrsten Sinema speaks on Capitol Hill

Sen. Kyrsten Sinema recently left the Democratic Party to register as an Independent. (Anna Moneymaker)

Sinema and Brown's seats were also considered toss-ups by the Center for Politics' analysis, and Sen. John Tester, D-Mont., made his way onto the list as well.

Tester already faces potential competitors in the Big Sky State as newly elected Rep. Ryan Zinke, R-Mont., and Rep. Matt Rosendale, R-Mont., reportedly have their eyes on flipping the Montana seat.

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The Democratic Senatorial Campaign Committee (DSCC) did not respond to Fox News Digital's request for comment on the new ratings.