There is a 1971 case with US mom, Italian dad, and born in Italy. Guy was born a citizen. SCOTUS premised the entire case (and many more similar) on the baby being born, naturalized.
-- How is Obama in office if such a ruling was made? --
Obama's case is different. Born in the US (supposedly). There is no recent precedent like Obama - I do think there are some old ones, but the 1898 Wong Kim Ark case (Chinese born in the US to permanent resident Chinese parents) overshadows all of the others.
Freekin birthers