When a dem lies people shrug it off and say politicians lie all the time. I don't think Bush did lie (ie he didn't know) because he had no reason to, there were enough reasons to go after saddam without that - reasons posted below by democrats - only 4 from my usual aresenal:
Gore repeats that Saddam MUST GO - June 2000
The Democrats' Case Against Saddam Hussein (Dems nailed, yet again)
Al Gore followed suit on Monday, albeit in much stronger terms, expressing concern that "[the President] is demanding in this high political season that Congress speedily affirm that he has the necessary authority to proceed immediately against Iraq." Gore went on to add, "no international law can prevent the United States from taking actions to protect its vital interests, when it is manifestly clear that there is a choice to be made between law and survival. I believe, however, that such choice is not presented in the case of Iraq" [speech, 9/23/02].
Saddam Abused His Last Chance, Clinton -clear and present danger to safety of people everywhere 1998
Better to stick to your own principles and visit political punishment condign on George W. Bush (within your own judgment of what is appropriate), and then handle the Democrats by broad, incisive, and frankly destructive exposition of their cynicism and worthlessness.