he thinks he has a chance at being elected anything, and he thinks his third wife (the one he cheated on his second wife with) will help him.
"As he prepares for a Republican presidential primary run he said Monday that he would formally declare his intentions on Wednesday Mr. Gingrich is presenting himself as a family man who has embraced Catholicism and found God, with his wife as a kind of character witness. Depending on ones point of view, she is a reminder of his complicated past, or his secret political weapon."
http://www.nytimes.com/2011/05/10/us/politics/10gingrich.html?hp
Newt has too much baggage and is past his prime. The fact that he sticks his finger in the wind to see which way it is blowing is no help. That being said, talking heads like Hannity love him and would back him........as much as they will back any candidate.