Conspiracy Dementia

Jonah Goldberg, a very entertaining writer on the right, offers this column at Real Clear Politics.

Here is the line that stunned me:

More than a third of Americans believe the U.S. government was likely to have been involved in 9/11.

I've watched C-Span's call in shows and been amazed, and somewhat sickened, at the number of conspiracy callers who blame the U.S. I was sent (anonymously, no return address) a copy of the ridiculous conspiracy theory "documentary" "Loose Change." But I would still not have guessed that over a third of Americans believed this nonsense. Goldberg does not provide a citation for this figure.