Depends on who he was up against (that had a chance in hell of winning). If it were Kerry or Hillary I definately would just as I did last time. For me anyway it seems like I usually feel backed into a corner voting for the lesser of two or more negatives rather than someone who has sold me on what he or she can do.
I'm pretty disenchanted with the presidential elections anyway because of the electoral process which to a large extent disregards the wishes of millions of voters and forces candidates to pander to states they know or think they can win and completely ignore others.