Never mind that the principal source of "intelligence" used in the claim was dismissed as a forgery, and a bad one at that, nearly a year before the SOtU address.
Also, see here, as well as the links included therein:
http://slate.msn.com/id/2085689/ (Thanks, Max)
Enjoy. The Bush administration has been furiously grasping at straws for a long time trying to prove the existence of WMD, and they have failed miserably. All signs point to a large quantity of bullshit, baked fresh for you at the White House. You know the old saying: "If it wakls like a duck, and quacks like a duck, it's probably a group of lying, money-grubbing bastards screwing the country."