The FBI and INS failures are what led to 9/11. Anybody with half a brain knew that OBL was going to keep trying to kill Americans, the FBI/INS failed to follow up leads or make sure that people who shouldn't be here weren't here.
I don't think he left Bush out to dry either. I don't remember the exact words, but I don't think Bush stated that WMD were an imminent threat.
I don't think the war was about WMD or freeing the Iraqi people, I think it was about doing what should have been done in '91, but the politicians had to come up with something for the press (who were going to twist things different ways no matter what) and WMD were an easy claim. I'd bet that %99 of those of us on FR believe that between '91 and '03, there were WMDs in Iraq, and that Saddam, given the opportunity, would have funneled them or some other sort of assistance, to OBL, and I don't think any of us believed the Saddam would use them against the US directly.
It's an interesting situation, Bush can't come out and say "we are just doing what should have been finished in '91".