U.S. v. Wong Kim Ark ruled that that specific requirement is met when the child's parents are permanently domiciled in the U.S. at the time of the child's birth.
Obama's father wasn't permanently domiciled in the U.S. in 1961, or ever.
Obama isn't even a legal U.S. citizen unless he naturalized as one at some point. He certainly wasn't born a U.S. citizen. The circumstances of his birth don't meet the 14th Amendment's requirements for birthright citizenship.
He was born to a US citizen mother, in the United States. Therefore, he is a natural born citizen. And whether you or I like it or not, there’s not the slightest doubt about his status.