Now, can you find something in the Constitution, Legislation or Case Law that defines Natural Born Citizen?
No, it isn’t, but the items it references can be admissible in court.
Look at the “Case law” area on the link.
How about the 20th amendment of the US Constitution:
“Section 3. If, at the time fixed for the beginning of the term of the President, the President elect shall have died, the Vice President elect shall become President. If a President shall not have been chosen before the time fixed for the beginning of his term, or if the President elect shall have failed to qualify, then the Vice President elect shall act as President until a President shall have qualified; and the Congress may by law provide for the case wherein neither a President elect nor a Vice President elect shall have qualified, declaring who shall then act as President, or the manner in which one who is to act shall be selected, and such person shall act accordingly until a President or Vice President shall have qualified.”
Nobody infests thread after thread for weeks, months, with their one-track mind comments--for nothing.
The Constitution defines very few of its terms. The Congress has power to provide for uniform naturalization, but not to define "natural born" for Constitutional purposes, any more than they can redefine "arms" for purposes of the Second Amendment. There is no case law, as there has never been any challenge in courts to the eligibility of a Presidential candidate based on not being "natural born". There was only one other were it was even discussed, and he was Vice Presidential candidate who became President, Chester Arthur. In his case it was alleged, variously, that he was not born in the US and that his father was not a US Citizen at the time of his birth. From what I've read, it seems likely that the latter was true, but that the former was not. But AFAIK, no court ever examined the issue.
How about 150 years of Presidential precedent during which every President was a living breathing definition of a Natural Born Citizen [except one who hid his past and burned his papers because he knew he wasn't one]. Will that suffice???
http://www.law.cornell.edu/uscode/html/uscode08/usc_sec_08_00001401----000-.html