Is Obama a Muslim?

"The more times a false claim is repeated, the more likely people are to be exposed to it. The fewer people exposed to a false claim, the less likely it is to spread. It is also important not to repeat false claims because people are more likely to judge familiar claims as true. As false claims are repeated, they become more familiar and thus may come to seem more true to people."

--Brendan Nyhan and Jason Reifler, discussing why the sheer existence of polls that ask, "Do you think Obama is a Muslim?" increase the chances of people saying "yes."