Dark Horse,
This is the first post of yours with which I violently disagreed.
War Powers Act. President can control the military for 60 days awhile without congressional approval, as long as he tells them about it (which he did).
Was this an "attack"? Bush attacked Iraq. He send troops in, destroyed their military, occupied their capital, and took over the country.
The US has treaties (including military obligations) with other UN members. The US is a member of Nato, and has military treaties with Nato members. Italy is demanding that Nato head this whole thing (which makes sense).
Obama has been very cautious in this Libyan affair. I disagree with a lot he has done, but he has handled the Libyan civil war properly.