If you read the full Duelfer report, as opposed to the headlines, you'll find out that it actually supports most of the pre-war intelligence assessment. It confirms, for those who might have been inclined otherwise, that Saddam maintained as much of the machinery for WMD development as he could possibly hold onto in the face of the sanctions and calls for inspections, and actively tried to give the impression that he was hiding something all along for what he perceived to be leverage. That he was dealing behind his back with French & Russian elements to gain the finances for reconstituting his weapons programs is plain as day.
Any President, given the overwhelming intelligence estimates available from both his own and other allied intelligence services, knowing what Saddam had already done, that he was sympathetic to and supportive of America's enemies, including al Qaeda (sorry, read the 9/11 Commission Report), and knowing the risks of leaving terrorists safe haven anywhere, who failed to intervene in Iraq would have been derelict in his duty to us. Kerry himself has said, given the same set of circumstances, he would have done the same thing, just "smarter," whatever that means. That Saddam had managed to fool the world's intelligence services, being defiant enough to maintain the fiction that he was hiding fully-constituted WMD, doesn't post-facto negate the wisdom of toppling his regime; it just puts the lie to the so-called wisdom of those who castrated our intelligence capabililities in the late 1980's and 1990's. The strident "Wrong war, Wrong place, Wrong time" mantra is just sickening political posturing.
And it is the height of hypocrisy to bash Bush 1.0 for "failing to get Saddam when he had the chance" while supporting the Kerry Doctrine, which would have absolutely precluded doing so. People forget, for all the talk about the "broad coalition" behind Desert Storm, a lot of that commitment and support was specifically conditioned on the requirement that we not take Saddam out. Had Bush 1.0 gone to Baghdad and taken him out in defiance of the express wishes of many coalition members, the Left would have been apoplectic.
Guess you know where I stand.