 Because he needs to if the theory of one bad night is going to win out. Does anybody really believe that that debate performance was an isolated incident? Was just a one bad night, never to be seen again. And of course, nothing like that ever happened leading up to the debate. No, no, no. It's been focused, energized, sharp as a tack Joe, until one little slip up in Atlanta on a much discussed evening. But who doesn't have?