Was that the actual poll question?
I saw a poll where over 8% believe the WTC towers are still standing. A 2001 Gallup poll showed 33% of people believe in flying saucers. The Flat Earth Society has over 3000 members. According to a 1999 Gallup poll, 6 percent of the US public believed the first moon landing was faked.
And you probabaly run into at least one of them every day!