As our Founding Fathers framed our new Constitution, they used the phrase "natural-born citizen" as though it needed no further definition or clarification. Indeed, they had a clear definition in mind which would have been common knowledge to all of them.
According to "The Law of Nations" written by Emerich de Vattel, a natural born citizen is born to citizen parents -- plural -- meaning both. Published in 1758 and well known to our Founding Fathers, this is the earliest credible pre-Constitution reference to natural born citizen. It is safe to suggest, then, that it is the definition our Founding Fathers had in mind as they penned our Constitution.
Click here to read more about Emerich de Vattel
Click here to read more about de Vattel's influence on the phrase "natural-born citizen"
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In light of the preceding and with much more information available, I maintain that Barack Obama is not and never was eligible to be President of the United States and furthermore, since Ted Cruz' father was not a U.S. citizen at his son's birth, Ted Cruz is not eligible to be President of the United States.