Check out naturalborncitizen.wordpress.com/
There is plenty of legal precedent for the term meaning someone born to two parents who are both citizens.
Hey - One of the earliest sites I was pointed to was the naturalborncitizen.wordpress.com blog. At first it seemed pretty damning, until I started finding out about what natural born citizen has historically meant.
As it is - keep in mind our friend and former president Chester A. Arthur - born to a british father and vermont mother. The supreme court, in 1873, in the case McCREERY’S lessee v. SOMERVILLE., found that daughters of a foreign born father were native born citizens. As I posted in our private commuciation, a federal appeals court used the term natural born citizen to apply to a man with two foriegn born parents. Alexander Hamilton, James Madison, and Thomas Jefferson all left notes behind as to what they meant by the term.