Is the RMA Unconstitutional?

The RMA doesn't give the protection that Obergefell gives to marriages performed anywhere in the country. The only place where there's the tiniest bit of wiggle room, I suppose, is with respect to the obligation of states to recognize out-of-state same-sex marriages. And so one could imagine a sort of willful Supreme Court that really, really doesn't like same-sex marriage denying Congress the power to mandate interstate recognition. But I also don't think it's likely that this Supreme Court would overrule Obergefell.