Now that he's made a decision to commit forces without congressional approval, Andrew Sullivan thinks so:
The proper response to this presidential power-grab is a Congressional vote - as soon as possible.
That will reveal the factions that support this kind of return to the role of global policeman, and force the GOP to go on the record. I also look forward to the statements of the various Republican candidates in support of this president. ...
A congressional vote is also important to rein in the imperial presidency that Obama has now taken to a greater height then even Bush. No plane should lift off, no bomb released, until the Congress has voted. I don't see why Obama should oppose this. He needs some Congressional support in an open-ended military commitment to ensure the protection of civilians in Libya.