Story highlights South Carolina Rep. Jim Clyburn endorsed Hillary Clinton for president on Friday

Clyburn's announcement was at Allen University in Columbia

(CNN) South Carolina Rep. Jim Clyburn endorsed Hillary Clinton for president on Friday, saying at a press conference that "my head and my heart are in the same place."

"I learned a long time ago that Hillary Clinton is a fighter and that's what we need in our next president," Clyburn, the highest-ranking African-American in Congress, said at Allen University in Columbia.

"I want to do everything I can to help Hillary Clinton crack the ultimate glass ceiling," he added.

Clyburn said he had worked with both Clinton and her primary opponent Bernie Sanders and that both were "pleasant and enjoyable."

"Hillary Clinton is far and away the best choice to reform our criminal justice system and restore the Voting Rights Act to its rightful place," he said.

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