We ARE talking about Time Magazine, so you can immediately eliminate the excellent suggestions of GWB, Karl Rove, The Marlboro Man, the New Media, Mel Gibson, etc. And the Swiftboat Vets don't even exist, do they?
Arafat or Michael Moore are the most likely possibilities (or George Soros, of course). Don't rule out Bill Clinton, coming off his heart surgery and opening of his "library."
Bush has a real shot at it, and deserves it.
I think it will go to the Bloggers and other online forums such as Free Republic, because of their impact on the elections.
If anything has changed the world in the past year, certainly they have.