If Huckabee were debating what is true religion, his remarks would be appropriate, but he claims to be debating political issues.
Huckabee's question (in the context of a political campaign) was idiotic. It was not bigoted.
Frankly, I would rather Romney be president than Huckabee. But Romney's church really does teach that Jesus and Satan were spiritual brothers and both were spiritual sons created by God the Father.
That means that Mormonism is not a Christian Religion. It looks like a Christian Religion, but then so does Unitarianism.