Actor and musician Jack Black endorsed Sen. Elizabeth Warren Elizabeth WarrenBiden's fiscal program: What is the likely market impact? Warren, Schumer introduce plan for next president to cancel ,000 in student debt The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon MORE’s (D-Mass.) presidential bid on Monday.

The comedic celebrity said he’s “all in” for Warren in an endorsement shared on Twitter.

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Black’s celebrity backing comes as Warren and her primary opponents prepare for their next battle in Saturday’s South Carolina primary, with a debate in the state on Tuesday.

Warren did not clinch the first- or second-place spot in the first three voting states, but the progressive senator had an influx of donations after a strong performance in last week’s Nevada debate.

Warren has received several celebrity endorsements for her campaign, including from “Queer Eye’s” Jonathan Van Ness and from U.S. soccer star Megan Rapinoe.