Returning it to the state IS the best way to fight gay marriage. And it is the correct CONSTITUTIONAL remedy. It is much easier to overturn a SCOTUS ruling - Congress can do that by passing a statute saying that the subject of marriage is restricted to the states, and by prohibiting SCOTUS from having jurisdiction over that statute. The only other option is to try to get a Constitutional amendment. Just because he is not fighting the way you want him to doesn't mean he is not fighting - he is just fighting in a way that actually has a chance of succeeding.
“Just because he is not fighting the way you want him to doesn’t mean he is not fighting - he is just fighting in a way that actually has a chance of succeeding.”
How is he fighting gay marriage when he leaves it up to the states and the Supreme Court ruling is now accepted as the law of the land? When he leaves it up to the states, he is not doing anything at all.