1. Neither Obama, Marco Rubio, or Ted Cruz are natural born citizens. At the times they were born, their Fathers were not citizens. Location of birth is irrelevant. Those who insist that a person must be born within the US point to Section 212 of Vattel. But one must read all that Vattel wrote on the subject and which is contained in Sections 213-217.
A “natural born” citizen inherits his citizenship from his parents. Just as he inherits his eye and hair color from them, so he inherits his citizenship status. He is “born” with the hair and eye color his parents gave him, and he is “born” with the citizenship status they gave him. No provision in the Constitution made him a Citizen – no Act of Congress made him a Citizen – just as no provision in the Constitution or Act of Congress determined his eye or hair color. His citizenship, eye color, and hair color are all inherited from his parents. THAT’s what a natural born citizen is. READ all of the sections on this which Vattel wrote: By the law of nature alone, children follow the condition of their fathers; the place of birth produces no change in this particular. In my first paper, you can find the links to Vattel and other original source documents illustrating the original intent of “natural born citizen”.