[EnderWiggins]

"Obama is a “citizen” of the United States by virtue of being born on United States soil, but he is also a “natural born citizen” by virtue of the British Nationality Act of 1730 [4 Geo. II, c. 21]."

You are almost correct.

Obama is a natural born American citizen by virtue of having been born on US soil (and not the child of a foreign diplomat or occupying army).

Whatever any British law calls him does not matter. If he is a "natural born British subject" by virtue of the British Nationality Act of 1730, it is of no relevance to his eligibility, because the US Constitution's requirement has already been met and we are a sovereign nation over whom Britain's citizenship laws have no effect..

[BP2]

Whatever any British law calls him does not matter. If he is a "natural born British subject" by virtue of the British Nationality Act of 1730, it is of no relevance to his eligibility, because the US Constitution's requirement has already been met and we are a sovereign nation over whom Britain's citizenship laws have no effect..

What when Obama's visiting England ...
... a British Subject in their jurisdiction?