If you believe him and you are a Christian, then you can accept that he, like everyone else, is a sinner, and that he has changed his ways after repenting. I think that is how Evangelicals get to supporting him, along with liking the venom of his attacks on Obama and his quick wit.

For the record, I do not want to see Gingrich as the candidate, much less as President. However, I can understand how morals voters can reconcile themselves with support for Gingrich.