Tonight on the Last Word: Joe Biden will be sworn in as president in 51 days. Also, House Democrats demand that Trump officials preserve documents during the presidential transition. Plus, nearly one million absentee ballots were requested ahead of Georgia’s runoff election. And Noah Harris talks to Lawrence about becoming the first Black man elected as Harvard University’s student body president. Sam Stein, Yamiche Alcindor, Rep. Sean Casten and Jon Ossoff also join Lawrence O’Donnell.