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.
President Obama has never been a "natural born citizen", as defined by the Supreme Court - MINOR V. HAPPERSETT IS BINDING PRECEDENT AS TO THE CONSTITUTIONAL DEFINITION OF A NATURAL BORN CITIZEN.
Barack H. Obama was born with dual citizenship.
House Report No. 784, dated June 22, 1874:
“The United States does not recognized a ‘double allegiance.’ By our law a citizen is bound to be ‘true and faithful’ alone to our government.”