Despite being widely reported in the media that the U.S. and other countries have not found any weapons of mass destruction in Iraq, surprisingly; more U.S. adults (50%) think that Iraq had such weapons when the U.S. invaded Iraq. This is an increase from 36 percent in February 2005.
The Washington Times suggests that the increase was driven by the (bogus) Hoekstra/Santorum claim that recovering degraded 1980s shells counts as finding WMD, which was widely hyped. It's possible. Any other ideas?