Veep?

It should be Hillary ...

Why?

“Obama’s measured style worked in the spring but hurt him over the summer ... One of the great strengths of the Obama candidacy has been the sense that this is a guy whose blood doesn’t boil, who carefully considers the options before he reacts ... But that’s also a weakness; sometimes the most rational response is to rip your opponent’s lungs ... That sort of spontaneity—that sort of real passion—is what’s missing from this candidacy. I suspect Obama will have a hard time winning unless he finds some of it.” ...

and if he doesn't at least offer it to her, he could lose ...