Donald Trump is among those currently making the claim that Barack Obama is not a "natural born citizen," as the Constitution requires a President to be. Despite all evidence to the contrary, polls show that some percentage of Americans believe Obama was not born in Hawaii, but in another country. It turns out the contention was first made in 2004 by Illinois Democrats. But it's Republicans and some of their leaders who are repeating it today. We look at the history of a false report, why some people cling to it and its possible impact on next year's presidential campaign.