Thanks for writing this up. For a FOX news segment, I think it went pretty well.
I think accpeting polygamy will go smoother once gay marriage is established. The main idea here is that it is about equality and it is not forcing monoganous couples to do anything different. The other fun argument will be to say that polygamy is supported by the Bible. That was a tough obstacle for homosexuality. (I am an atheist BTW, but I see most opposition coming from "family values" people.)