http://books.google.com.ph/books?id=oWLynZnattAC&lpg=PA645&dq=us%20citizen%20parents&hl=en&pg=PA585#v=onepage&q=natural%20born&f=false
The link to the testimony before the House Judiciary Committee defining natural born and matter of blood the same.
Would like to see the complete testimony of Dr. Laughlin.