I have thought since 9/12/2001 that Congress should have been convinced by GWB to formally declare war against every entity on the State Dept.'s Designated Terrorist List, as well as their state and private supporters both here and abroad.
The list includes organizations such as Shining Path and the Tamil Tigers, but we would have taken no requisite obligation to attack them while maintaining a national and international focus on smashing all of the Muslim Nazis from the very outset.
The Constitution places no particular limits on who or what may be the target of a formal Declaration Of War.
As I said in a previous post. I think a declaration of war would just make Conservatives feeeeeeel better. It wouldn't at all make Democrats act better.