From my D.C. Evangelical Who Really Doesn’t Want to Vote for a Mormon But Will If Romney’s the Best Guy:
Of course Huckabee knows everything there is to know about Mormonism. He already knows that they believe Satan and Jesus are brothers-their uber-theologian, Bruce McConkie, acknowledged this “fact” multiple times in his definitive works on Mormon theology (as did many of the church’s presidents, especially Spencer Kimball). All I think Huckabee was trying to do was (somewhat unsuccessfully) play the “Holy crap, that’s weird” hand.