No state has any right or legitimate authority to overrule the laws of nature and nature’s God. All they possess is the obligation to order their laws and policies thereby.
Well, the States are the Laboratories that prove ideas and policies harmful or advantageous. Witness Walker with Wisconsin unions, Texas with taxes, California with over-regulation.
If a state wants to welcome same-sex, those seeking it will abscond to it, leaving the state that denies them it. Win-Win, if you ask me.