The last Supreme Court case pertaining to natural born citizen is the Elg case from the 1930’s. Elg’s Swedish parents came to the US, naturalized before Miss Elg was born, the parents then took their daughter back to Sweden, but at the coming of age, Miss Elg wished to return to the US and thus after her persistant efforts, the Supreme Court decided that Miss Elg, being born to 2 US citizen parents was a natural born citizen and ordered the State Dept to reinstate her passport.
I don’t know how you found this case but is the key to removing Obama from the office he is not entitled to hold!
PERKINS V. ELG, 307 U. S. 325 (1939) — US Supreme Court Cases ...
Cited by 442 - Related articles
(Aetna Life Ins. Co. v. Haworth, 300 U. S. 227), declared Miss Elg “to be a natural born citizen of the United States,” and we think that the decree should ...
supreme.justia.com/us/307/325/case.html - Cached
But, since she was not running for President, the declaration of her as a natural born citizen was "dicta", not necessary to reach the conclusion of the cout, they only needed to determine if she was a citizen, which she of course was.