Lots of people are fretting about the persistent and mistaken belief of some Americans that Barack Obama is a Muslim. [Not that there's anything wrong with that!--ed.]

Over at his Politico blog, Ben Smith puts this 10% of mistaken Americans in perspective:

[L]arge minorities of Americans consistently say they hold wildly out-of-the-mainstream views, often specifically discredited beliefs. In some cases, those views should make them pretty profoundly alienated from one party or the other.

For instance:

22% believe President Bush knew about the 9/11 attacks in advance.
30% believe Saddam had weapons of mass destruction.
23% believe they've been in the presence of a ghost.
18% believe the sun revolves around the earth.