If you were against the idea of transforming the Middle East via war, you should be against Bush because he had the wrong idea. Conversely, if you were in favor of transformation you should be against Bush for making such a total hash of the idea.
However, if the reality is that you don’t seriously care about the war at all, but instead harbor only a fuming, obsessive desire to keep Democrats out of office at all costs, Bush is your man. I wonder how many of those people there are?