While I don't think it will matter a great deal, I think Romney
won this debate in a walk. We saw flashes of McCain at his
nastiest, and he even faltered on his strongest issue -- McCain
really was full-throatedly supporting the surge when Romney was
leaving wiggle room, and instead of making that point
straightforwardly he got bogged down on a petty tangent where he
was clearly in the wrong. Romney held his own, and he hit McCain on
his record without seeming rude.
Now, Romney needed more than a win, and I agree with Phil: I
doubt that this debate changed the dynamics of the race.