Responding to a comment (On this post) to the effect of "Sure Bush had the same info as Clinton, but Clinton didn't use it to go to war":

No body tried to use this intelligence before to go to war, but likewise nobody had to face this intelligence in the light of 9/11 either.

The intelligence said Iraq had WMD under Clinton as well as Bush, but under the Clinton administration there was a sense of security that isn't present after 9/11. 9/11 emphasized that there are people out there who want to kill us and when they try it isn't going to be in the form of an army massing at our border, it's going to be one guy in a downtown somewhere. In a world where we recognize that that threat exists you have to look at enemy nations with a severe hatred of you, a history of whimsical decision making, and (according to your intelligence) WMD differently than you did before.

Sure Clinton didn't start a war based on that intelligence, but he didn't seriously face the threat of Al-Qaeda either. Things change. In this case it wasn't the intelligence that changed but rather the perceived threat if the intelligence was right.