1. Congress has clearly NOT declared war.
2. Congress, through the joint resolution authorized the President to put the military into harms way, by clearly invoking the War Powers Act.
3. The Joint Resolution DOES NOT confer all the powers to the president that a Declaration of War would have, such as the authority to round up enemy non-citizens and detain them or ship them home.
4. Congress having taken up the issue, and acting with a limited authority joint resolution, the President cannot assume the state of war and assume all authority a declaration of war would confer on him. After all the Congress intentionally *did not* declare war.
JMNSHO