The kerfuffle over President Obama's birth certificate earned an originalist analysis of the issue by Chris Kelly, writer for Real Time with Bill Maher. Writing tongue-in-cheek, Kelly says, "If the Constitution says Barack Obama is ineligible to be president, he's ineligible to be president."
The Constitution is always right because the Framers were infallible, even about slavery and not letting women and Indians vote. The Constitution means what it says and says what it means, not unlike Horton Hatches an Egg, if it had been written 230 years ago by 55 guys.
The Constitution says:
"No person except a natural born Citizen, or a Citizen of the United States, at the time of the Adoption of this Constitution, shall be eligible to the Office of President; neither shall any Person be eligible to that Office who shall not have attained to the Age of thirty-five Years, and been fourteen Years a Resident within the United States.
And that's what it means.
I'm sorry, but I don't think we can get Obama on the "natural born" part. I don't know what it means and neither do you, and neither did the Founding Fathers. I think it had something to do with not letting Louis XVI be president or black people vote, but your guess is as good as mine. And guesses don't count.
The only person I'm absolutely certain is a natural born man is Bo Diddley.