By Judy Miller. Really. She's full-o-shit.
What all of the intelligence community understood was that whatever the WMD capacity was of Iraq, it was insignificant. That they were uncertain of Saddam's efforts or intents , that I can see. It's hard to prove a negative. But part of the effect of the propaganda effort was to change the question. "Saddam would like to have chemical weapons". "Saddam is trying to make them". "Saddam would make them if we normalize relations".
I think politicians on the other hand were often eager to be fooled. They were deliberately gullible because they often thought taking over Iraq was not such a bad idea. Because of a simple logic that removing something bad would make things better. Because they thought it a good idea to redesign the neighborhood. Because they didn't see any other way to end the blockade. Because being perceived as being fooled was preferable to being perceived as afraid to row against the current. Because they thought it was going to succeed and didn't want to be on the wrong side afterwards.
In practice what happens with propaganda is there is no real center anymore of people who really know what's going on. Everyone is just believing someone elses lies. The same is still going on about Iran.