Huckabee also claimed to Pat Robertson's CBN that "I'm the only guy on that stage with a theology degree," but he doesn't have a theology degree--he only attended Southwestern Baptist Theological Seminary for a year, he's a theology-school dropout.
Then there's his role in calling for the 1999 release of convicted rapist Wayne Dumond, who was strongly defended by Baptist minister Jay Cole, a close friend of the Huckabee family. Some conservative activists apparently defended Dumond on the grounds that one of his rape victims was a distant cousin of Bill Clinton and the daughter of a major Clinton campaign contributor. Several victims wrote letters to Huckabee describing Dumond's brutality, but Huckabee was quoted in a column by Steve Dunleavy titled "Clinton's Biggest Crime--Left Innocent Man in Jail for 14 Years" saying that "There is grave doubt to the circumstances of this reported crime." But as we know today, Dumond was guilty--he was released from prison in September 1999, apparently with some help from Huckabee, and he raped and murdered two women. Huckabee has refused to release his administration's records pertaining to Dumond on grounds that they contain sensitive law enforcement information.
In 1992, Huckabee called for AIDS victims to be quarantined, and refused to retract that position just recently, despite the fact that the disease is not spread through casual contact (which was also well known in 1992).
On top of all of this, Huckabee appears to be genuinely dumb. While governor of Arkansas, Canadian comedian Rick Mercer fooled Huckabee into congratulating Canadians on preserving their capitol building, the national igloo. He is a proud disbeliever in evolution and has publicly supported creationism, though now he refuses to answer questions about it. He thinks that women's role in marriage should be to "submit herself graciously to the servant leadership of her husband". And in the December 11 Republican debate, Huckabee pledged to repeal the laws of thermodynamics, stating that "We ought to declare that we will be free of energy consumption in this country within a decade, bold as that is."
Intrade currently puts Huckabee's chances of obtaining the Republican presidential nomination at 16.8%, third behind Giuliani (36.0%) and Romney (22.0%) and ahead of McCain (8.8%) and Paul (8.5%). But it also puts him at the leading candidate for getting the Republican vice presidential nomination, at 28.9%, well ahead of Pawlenty (10.1%), Romney (8.6%), Thompson (7.6%), and Gingrich (6.5%).
UPDATE (December 25, 2007): Mike Huckabee's tied to Christian reconstructionists and thinks that the Ten Commandments are the basis of U.S. law (even though seven of the ten would be unconstitutional).