That makes him a natural born citizen. "Natural born" simply means citizen by birth, as opposed to naturalization.
Some Obots want to stay focused on birth location because they know Obama's Certificate of Naturalization is the key to his ineligibility for POTUS.
What certificate? Why would he have needed to be naturalized?
Actually, no, it doesn't. As the SCOTUS ruled, natural born means "without doubt." It was a characterization reserved EXCLUSIVELY for those who are born in the country to citizen parents. If you're not, then there would be doubt. This has been shown to be so in several decisions.
Barry Soetoro, born in Honolulu, HI on Aug 4, 1961 was an Indonesian national when he enrolled at St. Francis Assisi, Jakarta, Indonesia.
He couldn’t have been a Natural born citizen of the U.S. because he is a citizen of Indonesia. Indonesia does not allow dual citizenship. Eventually, Barry Soetoro, moved back to the U.S., changed his name to Barack Hussein Obama II and obtained US Citizenship through the naturalization process.