I think it might be a Republican election. With Giuliani, Rice, and McCain, we have the three Republicans that Democrats like. except...
Rice won't get it because the left side of the media has recognized her condidacy for some time and saw the threat that a "Black Female" could cause to the Democrats, so they began making her the target of "house" jokes, and ruining her credibility.
Rudy is a moderate with what is probably the highest approval rate of anyone in the nation, after the events of 9/11. But he won't get the support of the Republicans, because they have a history of not backing the good guys( Once Bush Sr. showed his true/good side, they didn't support him in 1992)
McCain... well... If it is possible for a Republican to be the puppet of the Democrats, its McCain(not to say it is possible).
Hillary Clinton doesn't have a shot because the left-media has made such a fuss about the aristocracy that has formed with having 2 Bush's and the possibility of a third(because certain aspects of the left-media are idiots.) And having another Clinton would mean we'd have 20 years of presidents from only 2 families. Bad ju-ju... Plus, she's Martha Stewart's evil twin.
Al Gore doesn't have it for the Democrat spot because, well, he whines a whole lot and thinks he invented the internet. No one wants that in the white house unless someone is bangin' an intern.
John Edwards might, because every wants a president that can talk to the dead :-)
John Kerry won't do it because, well, even the Democrats don't believe him.
Newt Gingrich won't make it because... She turned him into a NEWT! But he got better!
Frist and Biden. This is what most ballots will have written on them: "Who?"
So, with all this in mind, there is only one clear answer.
Darth Nader in 2008