Article I, Section 8, of the US Constitution, clearly gives Congress the authority to declare war. In its wisdom, Congress allowed the president to initiate war action in certain circumstances, defined in the War Powers Act. Section 2(c) instructs the president in the use of War Powers:
"The constitutional powers of the President as Commander-in-Chief to introduce United States Armed Forces into hostilities, or into situations where imminent involvement in hostilities is clearly indicated by the circumstances, are exercised only pursuant to (1) a declaration of war, (2) specific statutory authorization, or (3) a national emergency created by attack upon the United States, its territories or possessions, or its armed forces."
At the beginning of the U.S. military intervention in Libya, the Obama administration has cited the 1973 War Powers Act as the legal basis of its ability to conduct military activities for 60 days without first seeking a declaration of war from Congress. The military intervention started on March 19; Congress was notified on March 21. Those 60 days expire today.
Any further action by the US Military in Libya is in direct violation of the US Constitution and War Powers Act.
Have no fear, Obama's war will continue, the Rule of Law in the US is dead, Congress has no balls, and there will be no accountability to the Dictator and Chief Obama.