NBCUniversal December 20, 2018 9:42 am Obama Plays Santa for a Day at DC Hospital Former President Barack Obama was Santa Claus for a day, surprising staff and patients at the Children’s National hospital with a red cap and a big red sack. US & World Videos 2:43 ‘On the Dot' to redevelop stretch of Dorchester Avenue 1:49 Finalists in math competition hope their model helps ease housing crisis 14:31 @Issue extra: Seth Moulton on pro-Palestinian protests, TikTok and more 2:31 Celtics preparing for pivotal Game 3 against Heat in Miami 1:17 Patriots player visits Franciscan Children's Hospital