The douchebag who wrote DOMA is now against it because it impede's states rights. That's kind of like me saying I'm against the institution of marriage because I like to sleep around. But on second thought, I like to sleep with bi-curious housewives, so lets keep marriage.
The point being, that marriage rights should not be a political football, kicked around to serve the whimsy of divisive demagogues. It is an inalienable right for all of us to enter into legally binding contracts, give up sex and become bitter.