Hawaii became a state in 1959 and in the law is considered “in the U. S mainland,” even though Hawaii Islanders use the word differently.
So Obama probably meets the requirement of being born “in the U. S. mainland,” but he does not meet the requirement of two U. S. citizen parents.
That he was born a Kenyan citizen and British subject only serves to underline the fact that he is not now, nor ever has been a “natural born citizen.”
Where is that requirement laid out? Because if true the you've just elimintated Bobby Jindal, too.