In an interview with beliefnet.com Mike Huckabee equates opening up the definition of marriage to include gay marriage is equivalent to opening it up to bestiality. (Found via TPM Election Central.)

From the site:

QUESTIONER: Is it your goal to bring the Constitution into strict conformity with the Bible? Some people would consider that a kind of dangerous undertaking, particularly given the variety of biblical interpretations.

HUCKABEE: Well, I don’t think that’s a radical view to say we’re going to affirm marriage. I think the radical view is to say that we’re going to change the definition of marriage so that it can mean two men, two women, a man and three women, a man and a child, a man and animal. Again, once we change the definition, the door is open to change it again. I think the radical position is to make a change in what’s been historic.