Sen. Kamala Harris Kamala HarrisThe Hill's Campaign Report: Trump and Biden vie for Minnesota | Early voting begins in four states | Blue state GOP governors back Susan Collins Kamala Harris: Black Americans have been 'disproportionately harmed' by Trump Biden town hall draws 3.3 million viewers for CNN MORE (D-Calif.) on Monday endorsed Jaime Harrison, Sen. Lindsay Graham’s (R-S.C.) 2020 challenger.

Harrison “believes every South Carolinian deserves the opportunity to not just get by, but to thrive and succeed,” Harris said in a statement to The Associated Press. “I am confident he will continue to fight for South Carolinians in the Senate. I am proud to endorse Jaime Harrison for U.S. Senate.”

Harris is the second senator and former 2020 Democratic contender to back Harrison, a Democratic National Committee associate chairman and former South Carolina Democratic Party chairman. Sen. Cory Booker Cory Anthony BookerBipartisan praise pours in after Ginsburg's death DHS opens probe into allegations at Georgia ICE facility Democratic lawmakers call for an investigation into allegations of medical neglect at Georgia ICE facility MORE (D-N.J.), a former Yale classmate, has also backed him.

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Harrison also has the endorsement of House Majority Whip James Clyburn (D-S.C.), a political mentor with a reputation as a kingmaker in the state. Clyburn’s endorsement of former Vice President Joe Biden Joe BidenSenate Republicans face tough decision on replacing Ginsburg What Senate Republicans have said about election-year Supreme Court vacancies Biden says Ginsburg successor should be picked by candidate who wins on Nov. 3 MORE is largely credited with helping deliver Biden’s landslide victory in the Palmetto State’s Democratic presidential primary, revitalizing his campaign and beginning his path to front-runner status.

Harrison’s Senate bid against Graham, a vocal ally of President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE in a state where the president remains popular, is considered a long shot, but he has seen record fundraising, pulling in $3.5 million in the fourth quarter of 2019 with $4.6 million cash on hand at the beginning of 2020.

Graham, meanwhile, posted $3.9 million in fundraising for the quarter, a new personal record, and had $10.3 million cash on hand, the AP said.