Rep. James Clyburn (D-S.C.) is planning to endorse Democratic presidential hopeful Hillary Clinton Hillary Diane Rodham ClintonHillicon Valley: FBI chief says Russia is trying to interfere in election to undermine Biden | Treasury Dept. sanctions Iranian government-backed hackers The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters FBI chief says Russia is trying to interfere in election to undermine Biden MORE, according to a BuzzFeed report.

The report cites two unnamed sources, one in the Clinton campaign and another Democrat.

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The endorsement is a big win for Clinton just over a week before the party's Feb. 27 primary in South Carolina.