Which ones? All the ones I click seem to be in favour :)

Regardless, they might have voted against the operation but then voted for various smaller bills "supporting the troops", which is an entirely reasonable position.

I'll have to go back to my notes, but I'm pretty sure I found a lot of opponents, but maybe I'm remembering wrong. Thank for pointing this out, I'll have another closer look !

The lead up to the war was very much "you're either with us or against us". It took a lot of courage to speak against the war. Even the media had to get in line - I think all news networks hired military consultants at the time.

Over time some that voted for invasion adjusted their stance. This may be why you felt there were a lot of opponents.