Tonight on the Last Word: Democrats make their final push ahead of the Nevada caucus. Also, more than 2,000 former Department of Justice officials call for Attorney General William Barr to resign. Plus, Jon Ralston talks to Lawrence about the state of the race ahead of Wednesday’s Democratic debate and Saturday’s Nevada caucus. John Bolton breaks his silence after the conclusion of Trump’s impeachment trial. And Lawrence explains why golf should be considered a serious issue in the presidential campaign. Ben Rhodes, Ruth Marcus, Mark Thompson, Sam Stein, David Laufman, Matt Miller and Neera Tanden also join Lawrence O’Donnell.