Actually, the Supreme Court has said the 14th merely restates the definition of natural born citizen:
“The real object of the Fourteenth Amendment of the Constitution, in qualifying the words, “All persons born in the United States” by the addition “and subject to the jurisdiction thereof,” would appear to have been to exclude, by the fewest and fittest words (besides children of members of the Indian tribes, standing in a peculiar relation to the National Government, unknown to the common law), the two classes of cases — children born of alien enemies in hostile occupation and children of diplomatic representatives of a foreign State — both of which, as has already been shown, by the law of England and by our own law from the time of the first settlement of the English colonies in America, had been recognized exceptions to the fundamental rule of citizenship by birth within the country. Calvin’s Case, 7 Rep. 1, 18b; Cockburn on Nationality, 7; Dicey Conflict of Laws, 177; Inglis v. Sailors’ Snug Harbor, 3 Pet. 99, 155; 2 Kent Com. 39, 42.
The principles upon which each of those exceptions rests were long ago distinctly stated by this court. [p683] “
http://www.law.cornell.edu/supct/html/historics/USSC_CR_0169_0649_ZO.html
There is not and has not been a requirement for two citizen parents for NBC status, even back in the 1840s:
“And the constitution itself contains a direct recognition of the subsisting common law principle, in the section which defines the qualification of the President. “No person except a natural born citizen, or a citizen of the United States at the time of the adoption of this constitution, shall be eligible to the office of President,” &c. The only standard which then existed, of a natural born citizen, was the rule of the common law, and no different standard has been adopted since. Suppose a person should be elected President who was native born, but of alien parents, could there be any reasonable doubt that he was eligible under the constitution? I think not.
(pg 250)
6. Upon principle, therefore, I can entertain no doubt, but that by the law of the United States, every person born within the dominions and allegiance of the United States, whatever were the situation of his parents, is a natural born citizen.”
http://tesibria.typepad.com/whats_your_evidence/Lynch_v_Clarke_1844_ocr.pdf
You read my comment up above citing minor which says "The Constitution does not, in words, say who shall be natural-born citizens." and you still want to post that the 14th defines "natural citizen"?
That sir, is cognitive dissonance.