 CBS News brief. President Biden says he's staying in the presidential race. Appearing on MSNBC. Here's the deal. It's not going to happen here this time around. The American public is not going to move away from me as an average voter. And he also released a defiant letter to congressional Democrats. Some top members of his own party have called on him to step aside. Political scientist Larry Jacobs. The president's letter is a sign of weakness.