
Michael R. Bloomberg, Pete Buttigieg and Elizabeth Warren before the debate. (Matt Rourke / Associated Press)

Onstage in Charleston. (Patrick Semansky / Associated Press)

Bernie Sanders and Joe Biden. (Matt Rourke / Associated Press)
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Joe Biden, left, Amy Klobuchar and Tom Steyer. (Patrick Semansky / Associated Press)

Bernie Sanders and Joe Biden. (Win McNamee / Getty Images)