[Tarpon]

Interesting but — The 14th addressed USA citizenship not natural-born citizen ... As called out in the U.S. Constitution Article II ... To be President, not only must you be a citizen, but you must also be natural-born citizen. Only natural-born U.S. citizens, or those born abroad, but only to parents who were both at time of birth citizens of the U.S., are qualified to be president of the USA.

So I point you here — http://www.freerepublic.com/focus/f-news/2470873/posts

The founders purpose of including ‘natural-born citizen’ as cited in the U.S. Constitution and many founding documents, as opposed to ordinary ‘citizen’ was to insure the continuance of USA heritage.

Hence the issue is where is Obama's real birth certificate and proof his father was a U.S. citizen at time of birth, which he most certainly was not.

[El Gato]

Only natural-born U.S. citizens, or those born abroad, but only to parents who were both at time of birth citizens of the U.S., are qualified to be president of the USA.

Not even they are NBCs. Unless their father (or today either parent) were serving in the Armies of the nation, or it's diplomatic corps. See Vattel, "Law of Nations", Book 1, sections 212 and 217.