Are you already ruling Paul out?
I don't like Paul's foreign relations stance, but I decided I like him best of the remaining contenders. I'll vote for Romney, but if Gingrich wins... I'll vote 3rd party and spoil my vote.
I don't see much harm happening because I expect the republicans to keep the house. However, if they also win the senate. I do not want the presidency held by Gingrich! In such a case, I prefer Obama remain. Nothing done is better than what the establishment crowd will attempt.