A President doesn't have any Constitutional or statutory authority to nullify gay marriages.
Which is what struck me when I read it. But still, for Santorum to go out on a limb and say it....

Signor V. [/quote]
That's one thing that chaps me about presidential candidates ... the way they use I, I, I as if there are not two other branches of governemnt. I especially get chapped when a candidate states that they will lower taxes. No they won't. Only the Congress can do that. I think those candidates presume too much.
But Santorum is something of a religious fanatic. You usually don't hear of a Catholic described that way. But as a former Catholic, I know of what I speak.