Not much a president can do about it at this point is there. Outside of a much needed slap down of the court by the other two branches. There is nothing that can be done.
He or she can set a tone that gay "marriage" is reprehensible and that his administration will set a tone that elevates real marriage as the norm. Nothing in that comment even mentioned normal marriage as society's desired norm.
Ted's makin' promises and giving assurances to elicit donations. This isn't the first time.
We can hope that a conservative wins the presidency and then three or four of the old leftist bastards on the court slump over dead on toilet and that the new president fights hard to put true constitutionalists on the bench, that a state brings another case arguing for sovereignty on this issue and the will of the people finally wins out over judicially tyranny.