Bush said he had clear evidence of WMD's in Iraq, that he showed this to Blair and Blair confirmed. I think it would be fair to say that most people would agree that Hussein wanted WMD's.
So I think it's fair to think that most Americans and most in the international community believed that Iraq had WMD's. The argument was mostly over whether an invasion was an appropriate response.
It was only "crazies" who believed both that Bush lied and that he was able to either snooker Blair or convince him to join in the lie.
Sometimes the crazies are right, though.
Hm... "A proof is a proof. What kind of a proof? It's a proof. A proof is a proof, and when you have a good proof, it's because it's proven." - Jean Chretien, discussing what type of proof Canadian government wanted before assisting in a war with Iraq (which it ultimately did not)
Of course a (different?) large majority also believe the Earth is only around 10K years old.
So maybe selective/programmed memory is a more accurate term?
"In London, at least 750,000 people demonstrated in what police called the city's largest demonstration ever." Source: http://www.mindfully.org/Reform/2003/Protest-Iraq-War16feb03...
But they also believed that a war was an inappropriate response to the existence of those WMD's.
The television was always sure that the war was necessary, that Powell's speech was coherent, and that the government always knows best because it has access to secret sources that it can't reveal and our best interests at heart. Of course, the television is also in the arms business.