I concur with some others here: Newt is starting to look good. I will watch the next debates more closely to see if I can see some sort of change of spirit in him, some humility or something. To me, a conversion to Catholicism is a big thing - has he discussed it anyplace?
Some. He has, over the years, done some interviews with Raymond Arroyo -- mp3's should be available on the EWTN web site's audio liberary. His wife (Callista) is in the choir at the National Shrine in DC. That's how he got to know (and have theological discussions with) Msgr Rossi, the shrine's rector. I remember seeing him at the Masses there for several years prior to his conversion.
I would view his conversion like that of Robert Bork, a few years earlier.