The federal charges filed by the DOJ against the (remaining) Boston bomber stipulate that the bomber used pressure cookers as WMDs.
So to put that in context for those who may doubt that Liberalism is a mental disease:
To liberals, the pressure cookers used to bomb the Boston Marathon are weapons of mass destruction (WMD), but the chemical and biological agents used by Saddam on his countrymen (which we did find in Iraq during the war) were not.
Liberals are insane. Cognitive Dissonance is seen as a virtue.