When Utah was not permitted to enter the union until they aquiesced to the federal definition of marriage. That is your precedent. The feds defined marriage the states regualte. Ever it was, ever it shall be and you will know I am right when the SCOTUS equal protection ruling comes down in about two years from now when they decree the new "marriage paradigm".
I'm not looking to make enemies where I don't have to but the states rights bs is just that bs.
The trick is to go after the other guy's arguments and weaken or destroy them, without causing the chap to dislike you. I have a lot of practice in endeavoring to do that. Of course, I need to try to do that, since given that I take the minority position with sufficient frequency, otherwise I would probably be bounced from this neighborhood. :)