Who are the "birthers" -- the Americans who believe in the face of all available evidence that President Barack Obama was not born in the US and is therefore not eligible for the presidency?

A poll by Public Policy Polling reveals they're overwhelmingly white, conservative and male.

The poll found that nearly a quarter of Americans believe Obama was born outside the US, while 62 percent of Americans understand Obama is a native-born American and 14 percent are not sure.

Who are those 14 percent?

-62% are Republicans, 20% are Democrats, and 18% are independents

-57% are conservatives, 33% are moderates, and 9% are liberals

-56% are men, 44% are women

-86% are white, 7% are Hispanic, 4% are black, and 3% are other races

The poll does not reveal which brand of tinfoil the birthers prefer for their hats.