According to Woodward's book, Bush says he'll continue the war in Iraq even if the only ones left supporting him are Laura and their dog. And, presumably, he means it. Loose talk of winning or losing the war is, at this point, irrelevant. The president has defined our war aims in Iraq purely in terms of continuing the war indefinitely. For him, keeping all of these troops over there and handing the whole shitpile off to his successor is success. Nobody else should find that very comforting.
Why this isn't obvious to everyone I don't know.