“In order to be President you have to be a Natural Born Citizen, not a Citizen.”
Also, the sky is blue. What’s your point?
Because Jindal is a citizen and not a natural born citizen. He is not eligible:
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.
The founders only put two types of citizen in that clause. The only time a citizen could become president was at the adoption of the constitution until the grandfather clause ran out. Jindal fails to qualify and doesn’t meet Article 2 Section 1. His parents weren’t U.S. Citizens when he was born on U.S. soil.