This person thinks that Cheney was one of the principle architects of the Iraq war
Shows at least a partial timeline of when Cheney got involved. Way back in the 90s.
zfacts.com
I'm not really sure myself. I thought the Iraq war was justified by Bush administration on the basis of Hussein providing life insurance to families of suicide bombers in Israel, and by Hussein using Euros to trade oil instead of US dollars, and sold to the public using some BS about WMD.