http://www.washingtonpost.com/wp-dyn/articles/A20194-2004Feb6.html
Doesn't this outline in a non-partisan way all the proof anyone would need? It is "crystal", what actually happened. How can you argue with it, they took a corrupt gamble that the weapons were actually there and lost. So now it is time to pay, simple.
BYW - this took me about 1/2hour to find on the site, stumbled on to it. Seems like it should have been a screaming (Dean?) headline... but maybe I am disfunctional, look for yourself.