That might prove to be a more restrictive criteria than you think. Consider Obama's primary opposition: Clinton. Edwards. Biden. Dodd. All recorded a vote in favour of the Iraq invasion.I also read that Richardson was pro-AUMF in 2003. That's gotta rule him out. Whoever Obama chooses surely has to have been anti-war from the start.
http://www.senate.gov/legislative/L...ote_cfm.cfm?congress=107&session=2&vote=00237
Maybe Feingold is the man.