Joe Biden with Rep. Jim Clyburn at the World Famous Jim Clyburn Fish Fry in Columbia, South Carolina in June 2019. Photo: Logan Cyrus/AFP via Getty Images

House Majority Whip Jim Clyburn (D-S.C.), the highest-ranking black member of Congress, endorsed former Vice President Joe Biden Wednesday, days before South Carolina's primary.

Why it matters: Clyburn wields tremendous political influence in South Carolina, where a weak showing by Biden could be the death blow to his presidential campaign. Biden has long viewed the state as his firewall due to his strong support among black voters, who make up about 60% of South Carolina's Democratic electorate.

"I know Joe Biden. I know his character, his heart, and his record. Joe Biden has stood for the hard-working people of South Carolina. We know Joe. But more importantly, he knows us. In South Carolina, we choose presidents. I’m calling on you to stand with @JoeBiden."
— Clyburn tweeted

Watch Clyburn's emotional speech:

Go deeper: 4 takeaways from the South Carolina debate

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