Since the odds on Newt are rising pretty high these days.
I'll throw one out that while not probable has a pretty decent chance(given Newt's style), Gov. Luis Fortuno. Look it up.
He is not necessarily a Republican.
Are you serious? He is Republican Governor. A member of the Republican party. He is a member of the RNC. And he has probably cut spending by a percentage equal to practically all other Republican governors in the country combined and now the economy is starting to boom.
I said I'd like the idea back in June, but it's also important to note that he has abysmally low approval ratings... although I expect them to pick up dramatically by Summer 2012. A brilliant record, however, and he is altogether my favorite choice.