The debate starts at 9 p.m. on Tuesday, Jan. 14. The event will air on CNN, CNN International and CNN En Español and will be livestreamed at desmoinesregister.com and CNN.com. Last Democratic presidential debate of 2019 Chris Carlson | AP South Bend, Indiana Mayor Pete Buttigieg and Sen. Elizabeth Warren during the Democratic debate in December. What is the lineup for the January Democratic debate? The six candidates sharing the stage will be: Vermont Sen. Bernie Sanders Massachusetts Sen. Elizabeth Warren Former Vice President Joe Biden Minnesota Sen. Amy Klobuchar South Bend, Indiana Mayor Pete Buttigieg Billionaire businessman Tom Steyer