 You're listening to The Newsroom with me, Paul Moss. There's a certain kind of boxer who only really seems to find his form when he's on the ropes, who comes out punching just when his opponent doesn't expect it. The same might be said of Joe Biden, who really did go on the offensive on Monday. You want me to stand down, he said rather pugnaciously. Will one of you come out and challenge me for the candidacy?