Has The President Exceeded His Authority By Waging War Without Congress? [Unedited]

The President has launched a sustained, long-term military campaign against the Islamic State of Iraq and the Levant. But did he have constitutional power to do so? The Constitution carefully divides the war powers of the United States between Congress and the President. Article II provides that “The President shall be Commander in Chief.” But Article I provides that “The Congress shall have Power … To Declare War.” Did the President exceed his authority and violate the Constitution?