According to an anonymous "prominent Republican" quoted in Politico, Mike Huckabee almost ran for president in 2012 just to beat Mitt Romney. There was no love lost between the candidates during the 2008 race, with Romney sending out a mailer suggesting Huckabee was soft on punishing meth offenses and the death penalty and Huckabee calling out Romney for not having hunting bona fides, not being able to eat fried chicken correctly, for his religion ("Don't Mormons believe that Jesus and the devil are brothers?" he told the New York Times Magazine) and, perhaps most memorably, for his time at Bain Capital ("I want to be a president who reminds you of the guy you work with, not the guy who laid you off.").
But 2012 represents a new era, where Huckabee is too busy planning for a country music variety show in Branson, organizing his 16th guided tour to Israel (only $4,600 for double occupancy!) and counting his Fox money to tear into Romney. Instead, he's mastered the art of tepid endorsement.