Obama’s mother was to young to pass along American citizenship. His father was a British citizen. Obama is not a natural born American citizen (until he proves it and I don’t believe that he can).
Irrelevant, if he was born in Hawaii, as the officials of the State of Hawaii have said he was.
Obama is not a natural born American citizen (until he proves it and I don’t believe that he can).
He has proven it to the satisfaction of the full membership of the House and Senate, who certified his election. Until and unless the courts get involved (and, so far, none has), that's all that matters.