Even if this is real, it doesn't matter. Obama was still eligible to be President as one of his parents was a U.S. citizen which makes him a natural-born citizen.
"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."
Even if this is real, it doesn't matter. Obama was still eligible to be President as one of his parents was a U.S. citizen which makes him a natural-born citizen.
"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."