Obama - 6 (with potential to be a 9 or 1)

McCain - 5

Clinton - 4

One of the benefits of a McCain win, I would hope, would be the beginning of movement of the Republican party away from its Southern religious base and back toward a pragmatic/business base. 

I don't want Clinton to win, for a variety of reasons, but I doubt she'd be as bad as some of you seem to think.

Obama is clearly the riskiest choice but also the one with the biggest upside.  When Newsweek talked about a "transformative" presidency, he seems the only one could make it that.