And then there's the one or two people who freak out that gay marriage will result in polygamy. Aside from that not really being a bad thing in itself, there's the fact that tax laws would have to be drastically re-written to accomodate multiple spouses.

Once again showing that most people against gay marriage don't seem to realize that marriage is a legal contract, not just a ceremony in a church. Once they realize that, they can no longer claim you can marry animals, children, objects, and corspes, because none of those entities can enter into contracts.