No doubt you've heard of these people. They are absolutely convinced that Obama was not born in the US, and nothing will satisfy them. Here's some in action:
Via mesyn191 in this iTulip thread. Scary, no? And doesn't it occur to them that if there were any serious reason to believe that Obama was not qualified for office, that John McCain or Hilary Clinton would have dug it up? I mean, wouldn't you, if you were in their position? No doubt the birthers would say they're in on the nefarious scheme too, though.
And as others have pointed out, no previous president has faced scrutiny of this type. Nobody spread rumours about JFK actually having been secretly born in Ireland. But to a lot of people, Obama doesn't look like a real American. And an awful lot of elected officials are reluctant to discuss their views on the matter:
Via Blaque. Oh, and by the way, the birth certificate is shown here.