Did I say using WMD's, et al for the excuse to invade? I did not.
The administration did say there were WMD's, ties to Al Qaeda, mobile chemical weapons factories, buying yellowcake from Nigeria (well, I didn't mention that one the first time around, but still...), et al, all of which have been refuted. As have the others I mentioned, up to the surge, and that remains to be seen yet.