Hate to break it to you, but they both had congressional authorization to do use military force, in spite of the Dems best attempts to backpedal later.
That having been said, it's still Obama's prerogative to veto his advisers. The question though is why? He still has not given an explanation for what is going on in Libya, and he has ignored the deadlines. His actions defy explanation. It's not like people are suddenly going to think he's hawkish for bombing the shit out of Libya.