If he was a citizen at birth then he is a natural born citizen.
The Obama issue came down to the age of his mother at the time and the law the required her to be of a of an age to provide birth right citizenship. see
http://www.state.gov/documents/organization/86757.pdf
As well as the good possibility that he renounced his citizenship or committed fraud at Columbia IF he applied as a foreign student
So wrong... omg. Citizen at birth happens everyday by force of statute. Natural born requires NO statute. Natural born means that NO statute is needed. The state of citizenship is NATURAL by simple circumstance. If you are born in country, of two parents who are citizen, your citizenship is uncontested and NATURAL. No statute is ever needed to clarify. Having just ONE parent who is not a citizen POTENTIALLY makes you citizenship questionable. This is proof that it is MERE citizenship at birth, not natural born citizenship.