Not a dumb question at all, but it gets complicated (according to snopes) because of Obama’s mother’s age and how long she was out of the country. “If a parent was a U.S. citizen at time of birth, he/she must have resided in the U.S. for at least 10 years, 5 of which had to be after the age of 16. Obama had only one U.S. parent (his mother)) and she had not resided in the U.S. for at least 5 years after she was 16 because she was 18 when she gave birth to Obama. Thus the claim of him not being ‘natural born'”. That is why the Hawaii issue continues to arise, because that would make him a citizen using the 14th amendment. I think it is a distraction from more important issues.