[jamese777]

You are in error. The requirement is to be a “natural born citizen” ~ not that he must actually be born in the USA. You can presently be born outside the USA and if one of your parents is a US citizen you will qualify. Not so long ago if you were born outside the USA to a foreign mother, or father, you were not automatically a US citizen.
There’s been little done in the way of court cases or statutes to hedge in and qualify what “natural born” really means.

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You’re correct about one thing, there is no legislation and no Supreme Court decisions on this issue. US law defines “Citizen at Birth” pretty carefully but the term “Natural Born Citizen” has never been further defined.
http://www.richw.org/dualcit/law.html#CitByBirth
Its a shame that the current Supreme Court has thus far rejected for lack of standing hearing every case attempting to apply the natural born citizen clause in Article Two Section One with specific regard to Barack Obama.
By refusing to hear any suits challenging Obama’s eligibility, the Supreme Court is in effect saying that Citizens by birth qualify as Natural Born Citizens.

[muawiyah]

Only if you agree that Obama is a "citizen by birth". At the time he was born his father, a foreigner, was here as a student on a student visa. The law then required that he LIST any children born in the USA on his visa.

US citizens, of course, wouldn't be required to be listed on such a visa, but here the law is clear. The question of Obama's claim on citizenship rests initially with his father's status, the legal requirement to be listed on his visa, and whether or not anyone has yet taken action to do so.

Whatever else is involved, the mother wasn't yet 19, and there are legal challenges resting on that problem.

We don't even have to have him born abroad (in Kenya or wherever) to question his citizenship.