Six Democratic candidates will participate in the seventh presidential primary debate on Tuesday night: former Vice President Joe Biden, former South Bend Mayor Pete Buttigieg, Sen. Amy Klobuchar, Sen. Bernie Sanders, businessman Tom Steyer, and Sen. Elizabeth Warren.

Six Democratic candidates will participate in the seventh presidential primary debate on Tuesday night: former Vice President Joe Biden, former South Bend Mayor Pete Buttigieg, Sen. Amy Klobuchar, Sen. Bernie Sanders, businessman Tom Steyer, and Sen. Elizabeth Warren.