If...

Newt Gingrich does win the South Carolina Primary today, it will be for two reasons:

1.) He threw the right tantrum at the right time in the right debate when John King tried to ask him about his second ex-wife's allegations that he wanted to have an "open marriage".
You'd think a loathsome thing like would damage Newt's candidacy, but no, the whole "I'm being victimized by the liberal media"meme is apparently much more powerful.

2.) Mitt Romney really can screw up a two car funeral, a week ago he was on the brink of wrapping up the GOP nomination, but a bungled debate performance and complete melt down on his tax returns coupled with the revelation of his mysterious Grand Cayman Island Bank accounts and voila the former Viceroy is once again on the ropes.
Clearly the taint of wealth supercedes the taint of personal debauchery in the current political environment.

Still and all that, I don't give long odds to Newt Gingrich his backstory is thoroughly weird and he has many many financial shenanigans in his baggage to explain...but unlike Romney he has credibility with the Southern Base of the GOP and the rhetorical gifts to back that up.
Ah but it's funny, this might be Newt Gingrich's last stand. I mean he has three wives and two exes on his rapsheet to date. If spouse #3, Callista cannot boot strap his ass into the White House then Newt cannot easily follow his instincts and change up wives again, he is a convert to Catholicism and the RCC does not permit divorce.
So its "conquer or die in 2012" for Newt so to speak.