I think Huck may run just to make a statement. He may not want to be president, but he wants to give the evangelical wing a stronger voice in the party. He has been whining about how they are being taken for granted for a while. The recent silence from most in the party after SCOTUS defacto made SSM legal in most of the country pissed him off. Hey loves making money on FOX but he can afford to take a year off and build his brand, and the money from Adelson wont hurt. If he has to throw in some lines about how great Israel is to his basic stump speech to get the Adelson cash, I'm sure he would be happy to do it.
If Huck gets in, Santorum might as well stay home as he was Huckabee-lite and a Catholic to boot.
The problem with that is Huckabee might actually win the nomination. I'm struggling to think of a stronger candidate then him (which is pathetic).