Hey, like many Americans -- I don't think Obama fully supports gay marriage.
Myself, I'm comfortable with gay couples receiving SOME PERCENTAGE of bereavement & spousal benefits -- based on their partnership. If one dies, the other one's sad. Fair enough. But the full 100% is for child-bearing, and that's not applicable.
Politically, it's not wise for him to take some 'pot-shot' position. All people want to do, is find a reason to chuck rocks. But there has to be a sensible middle ground.
This is Romney's kind of approach, too.