I expect the adultery and divorces are enough to doom him among the Republican primary electorate.
That's been out in the open an talked about for over a decade... people aren't going to move from pro to anti gingrich NOW because of that.
He has regained an image with republicans, used to be in the negatives. He continues to do well in the debates, and I still think he'll be the nominee, as I've thought for a long time. As long as Santorum, Cain, and Bachmann fall behind him he'll be solid moving into a 3 or 2 way race.