Elizabeth warren, let's just dig deeper on the rise that we're talking about in this poll. if you look back to march, she was at 9%. june, 15%, and now she is at 20%. joe biden, he's lost 7% which isn't that much considering the fact he came in with a huge name and now people are getting to know him, and that's why we're at this statistical tie. >> this is a huge danger, though, for joe biden. his numbers have just been going in the wrong direction since he got into the race. his problem is if you base an entire campaign on electability, what happens when you lose iowa? and since warren neighb...