The concept: Biden without the baggage. He’s a younger, more vigorous replacement if Biden falters.
The challenge: To be the one who picks up the pieces for realos if Warren destroys their champion. He’ll have lots of competition, including Harris and Booker.
The prognosis: Mayor Pete has plenty of intellect, but no swagger. It’s amusing to think of him ripping Trump a new one in Norwegian at a debate, but it won’t happen, because he just doesn’t have a strong enough presence. Chances of success: 5 percent.