Read Perkins v. Elg which states that a person born to one naturalized citizen and one non citizen is a "natural born citizen" of the United States.
I have examined the issue of Perkins v. Elg. It simply does not attempt to determine what is a natural born Citizen, per the presidential requirement in the Constitution.
Natural Born Citizens: Or How to Beat a Subject to Death with a Stick, Judah Benjamin, November 28, 2008
The Law -- Perkins v. ELG, CalperniaUSA