[UnbelievingScumOnTheOtherSide]

It doesn't matter. 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."

Unless Obama was born here or became a citizen before June 21, 1788 (when New Hampshire became the 9th state to ratify and the Constitution came into effect), he would not be legit.

[bushpilot1]

It is possible the author means..Polk was the first President born to US citizen parents after the ratification.