Wow, you aren't terribly bright. A state interest is needed to deny, not to grant a right.What you have done is prove that there is no state interest in marriage! There's nothing to protect! Obviously there's no need to subsidize it or deny any polygamist their style of it either.
...or are you just out for gubbermint money?..looking for that segue into applying Affirmative Action to gays too? Perhaps you think gays should always get to sit in the front seats on the bus too!
Sooner or later, even a Socialist has to realize that they are flaming nitwits!
Every state in the union has marriage, and thus far you seem to lack the brain cells to offer a valid state interest served by denying same sex couples the right to marry that would render such a restriction constitutional.