Democratic presidential candidate Bernie Sanders, an independent senator from Vermont, waves to supporters following a town hall meeting at Strawberry Hill Elementary School on Saturday, Dec. 12, 2015, in Anamosa, Iowa.
Democratic presidential candidate Bernie Sanders, an independent senator from Vermont, waves to supporters following a town hall meeting at Strawberry Hill Elementary School on Saturday, Dec. 12, 2015, in Anamosa, Iowa. Charlie Neibergall AP
Democratic presidential candidate Bernie Sanders, an independent senator from Vermont, waves to supporters following a town hall meeting at Strawberry Hill Elementary School on Saturday, Dec. 12, 2015, in Anamosa, Iowa. Charlie Neibergall AP

4 things to watch for in the Democratic debate

December 18, 2015 5:55 PM