Ron Fournier has written an excellent article on Mike Huckabee as a candidate and the "deathbed conversion" by that candidate to pull a negative campaign ad made in angry response to Mitt Romney's fact based anti-Huckabee Iowa ads. The fallout over the way the candidate chose to pull the ad and the possible effects on the way Iowans caucus is discussed here.

I have spent most of my life as a Democrat. I recently have seen fit to follow another course. I believe that the issues confronting us cross party lines.

From Ronald Reagan's 1964 speech excerpted at American Rhetoric.