Could you please cite the place in the Constitution, Legislation or Case Law that precisely defines natural born citizen?
http://www.uslaw.com/library/Academic/Natural_Born_Citizen_McCain_Papers_Comment.php?item=230437
http://papers.ssrn.com/sol3/papers.cfm?abstract_id=1263885
Also, I'd like you to clarify something. Is your argument that "natural born citizen" isn't definable, and therefore no grounds on which to challenge an Obama presidency? Or is it that Obama is a "natural born citizen"?
Those are links to someone’s essays, not legal citations.
While I did not go to law school, it is my understanding that random people’s essays are not used in Court to decide cases.
Instead, courts like to look at the Constitution, Case Law and Legislation.
Now again, could you please find me documentation in the Constitution, Case Law and Legislation that defines natural born citizen?