Harvard Law professor Alan Dershowitz said Tuesday that he plans to campaign for Republican candidates in the upcoming midterm elections, marking a significant departure from his six-decade affiliation with the Democratic Party.

During an appearance on The Record with Greta Van Susteren on Newsmax, Dershowitz said that the Democratic Party’s embrace of political extremism and abandonment of constitutional values left him no choice but to support Republican efforts to retain control of Congress.

“They’re [Democrats] not succeeding in persuading the American people that they’re up to a leadership role, which is why, after me being a Democrat for 60 or more years, I am now going to campaign very hard for the Republicans to maintain control of the House and the Senate,” Dershowitz said.

“Not because I love the Republican agenda. It’s because I’m totally frightened if the Democrats were to gain control of either House. Who they would appoint as chair people? Who they would put in the position of inquisitors, and how they would deny rights to people, and how they would introduce a kind of McCarthyism that we haven’t seen since I was a college student in the 1950s.”

Dershowitz, who has long described himself as a liberal Democrat committed to civil liberties, said the party’s current leadership has prioritized attacking President Donald Trump rather than focusing on governance or bipartisan cooperation.

He cited what he described as “left-wing McCarthyism” that has taken hold within Democratic circles.

“It’s left-wing McCarthyism. We’re seeing it throughout the Democratic Party with a few exceptions, like the great Senator Fetterman, who you interviewed, who really is the one person who represents principle, represents honesty, and really nonpartisan approaches in the Democratic Party,” Dershowitz told Van Susteren.

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The Harvard Law professor added that he wished more of his former Democratic colleagues would follow the example of Pennsylvania Senator John Fetterman, whom he praised for taking independent positions on policy issues.

“I wish his colleagues would learn from him, but they don’t. They are moving toward the extreme, extreme left, and the only thing they care about is trying to hurt President Trump,” Dershowitz said.

His comments come as several Democratic lawmakers have escalated rhetoric toward the president and his administration.

Kamala Harris referred to President Trump as a “fascist” during the 2024 campaign, while Representative Jasmine Crockett of Texas compared him to “Hitler” in multiple interviews.

Dershowitz said that such language reflects a broader problem within the Democratic Party, which he believes has moved away from constitutional principles and due process in favor of political vendettas.

The remarks also come as new polling data suggests that President Trump continues to maintain steady approval ratings among voters.

According to CNN senior data reporter Harry Enten, 52 percent of voters believe Trump is following through on his 2024 campaign promises.

Enten added that Trump’s consistent 43 percent approval rating indicates public confidence in his handling of key issues such as border security, inflation, and crime.

In October 2024, President Trump’s approval stood at 44 percent, and recent surveys suggest his support could pose a challenge for Democrats ahead of the 2026 midterm elections.

A New York Times poll shows Democrats leading Republicans by two points in generic ballot matchups, while a Yahoo/YouGov survey shows a four-point advantage.

Dershowitz’s decision to campaign for Republicans is yet another example of the ongoing political realignment among prominent figures who previously identified with the Democratic Party.

His statements mark one of his strongest public rebukes of Democratic leadership to date and signal his growing concern over the direction of the party heading into the next election cycle.