Why? Do you believe it is unconsitutional? My own thought is that the president has quite a bit of latitude when it comes to a military response made in self defense.
Believe me when I say that I truly don't have a chip on my shoulder on this issue - I am seeking the opinions of others in an effort to solidify my own.
If Congress declares war, the presumption is that they represent the will of the people in so doing. Without that declaration, the President is out on a limb. Put another way, with a declaration, the Pres's butt is covered. Without it, there's no reason to belive that the citizens of the USA should support it.
THIS situation obviously is different--the citizens should support Bush, because we were attacked. BUT...the precedent is bad. Bush is risking a lot without the declaration--OTOH, the Congress risks NOTHING.