Nobody has demonstrated that he is not a natural born citizen.
Barack Obama has publicly stated that his father registered him as a British citizen shortly after birth. This does not negate his being a U.S. citizen if he was born here. It does negate his being able to claim “natural born Citizen” status, something he has never done.
Obama has only claimed to be a citizen, not a natural born citizen.
It isn’t what I say that is important - it is what Obama hasn’t said or proven. He promised transparency but still hasn’t produced that long-form birth certificate, or allowed his college admissions records made public.