Polygamy can be very dangerous, extreme cases can even cause Romnesia.
Funny. Of course, the president didn't write that bit. He's not that funny. Also, I think he now needs to pay royalties to Jeff Foxworthy.
This video does point out the sheer hypocrisy of the right though. They were bitching and moaning about John Kerry being a flip flopper because his opinions on a few issues changed over the course of decades as he learned new things. Now Romney claims to hold polar opposite positions on the same day depending on who he's talking to, but no right-winger claims that Romney is a flip-flopper. Sheer hypocrisy.
By the way, I can actually think of a few reasons to consider polygamy or bestiality to be immoral, but none that apply to gay sex. And that's the point of this thread.
However, I can't think of a legitimate reason for polygamy to be illegal in a free nation. And that doesn't mean I'm for polygamy. I don't want even one wife, so I sure as hell don't want two! But just because I don't want something, doesn't mean I should be allowed to prevent other people from having it.