Unfortunately, evangelicals love Huckabee.
Meh, I don't like Huckabee at all, but there is no evidence that he is taking marching orders from some nefarious group trying to select our nominee. That's just conspiracy stuff.
If Huckabee runs he either thinks he can win, or thinks it will give him a bigger platform on TV, radio, or whatever in the future. Huckabee appeals mostly to a specific group of social conservatives who care almost only about traditional values issues, but he is a folksy guy and has just enough cross over appeal to possibly survive longer than we think in the primaries. Besides if Santorum also enters the race, and I suspect he will try again, they split that voter block and cancel one another out.