Figmo, since you seem to be the one who most often mentions this, do you have any references to any court decisions that have defined "natural born citizen" as meaning that both parents had to be citizens? As I'm admittedly not a lawyer, "natural born citizen" sounds, to me, like someone born in this country. Every reference I've found refers to the United States (and a few other countries, like Brazil and Canada) automatically conferring citizenship to anyone born inside their borders.

I'm not being sarcastic - I'm genuinely interested in seeing how far up the "judicial food chain" the definition you talk about has gotten.