The German intelligence agency is saying that the Bush Adminstration exaggerated the WMD claims of an Iraqi exile code-named Curveball, who "never claimed to produce germ weapons and never saw anyone else do so."
Interestingly, Curveball was known to be an unreliable, alcoholic liar (see here for more).
So by exaggerating his claims, the Bush Administration showed that an even a lying alcoholic stayed closer to the truth than the Bush presidency over Iraq.
UPDATE: just came across this: "Under questioning, Tenet added that the information in the [pre-war National Intelligence Estimate] had not been independently verified by an operative responsible to the United States. In fact, no such person was inside Iraq. Most of the alleged intelligence came from Iraqi exiles or third countries." I think this factoid makes Bush I and Clinton look bad, but it makes Bush II look horrible.