Each state has different terminology.
Really, the question of his eligibility, has never been about his non-citizenship but his non-"natural born citizenship".
The whole “natural born citizenship” whatever that means is not settled law. You could argue that John McCain is not a “natural born” U.S. citizen a lot easier than Barrack Obama who was in fact born on U.S. soil.
I think this b.c. has been a red herring from day one to keep the conspiracy folks preoccupied. Anymore time spent on this issue and you will look like a “truther”