House Majority Whip Jim Clyburn, who wields enormous influence in his home state of South Carolina, is planning to endorse Joe Biden on Wednesday, multiple sources with knowledge of the Democrat’s plans told POLITICO.

The planned endorsement is expected three days ahead of the state’s Saturday primary, giving Biden an important boost in a state that will likely determine the fate of his candidacy. Clyburn, the highest ranking African American in Congress, has long been close with Biden and has been open about his affinity for the former vice president during the Democratic primary.

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