 When asked why he thinks he's the best candidate to beat Donald Trump, Biden says because he has beaten him before and he has gotten more done than any president. Mike Quigley of Illinois is the latest congressional Democrat to call on the president to drop out of the race, telling MSNBC that to prevent utter catastrophe, Biden should let someone else do this. CBS's Scott McFarlane also reports. CBS News has learned the powerful Senate Intelligence Committee chair, Mark Warner, is trying to assemble his fellow Democratic senators to ask the president to leave the race.