Grammar likely facilitated the scamming required to skate his way back to citizen status (SSNs and all).
If Obozo's father was Barack H. Obama, Sr. and Obozo was born outside the U.S. (as I believe he was, possibly Canada), He never was a citizen, much less a "natural born" citizen as the Constitution requires. His mother was too young to transfer citizenship to her son, assuming a foreign birth.
The only way Obozo could be a "natural born" citizen is if someone other than BHO, Sr. was his father. That is possible. (FMD?) Barry the Bastard has no papers. His recent release is a forgery.