The question erupts from time to time in comments here whether a citizen of the United States, born abroad to American parents, is eligible to be president of the United States. I think that there is an affirmative majority view on this issue, but the Supreme Court has never ruled on it, and it remains a subject of debate among constitutional scholars (most recently prompted by the candidacy of Senator John McCain who was born in the Panama Canal Zone).
They believe that the courts are the only place to resolve constitutional ambiguity
Recently, some extreme writers on citizenship, who espouse crackpot views about the eligibility of President Obama, think that the voice of the people is rising up to demand that the courts decide any ambiguity in the question of who is and who is not eligible to be president of the United States. While certain that their views must prevail, they also believe that the courts are the only place to resolve constitutional ambiguity.
The ambiguity undoubtedly exists in some eligibility instances (although not seriously about Obama), but notwithstanding we have had an election and we have a president. In my recent research, I have met the idea that perhaps in the case where the courts do not intervene, the people may decide.
E. Corwin in his book: The President: Office and Powers, pp 32-34 (4th rev. ed. 1957) wrote:
Should then, the American people ever choose for President a person born abroad of American parents, it is highly improbably that any other constitutional agency would venture to challenge their decision.
And E. Fincher in his book: The President of the United States, pp 3-5 (1955) wrote:
It is generally assumed, however, that should such a person become a candidate for the Presidency, few would question his eligibility…. Moreover, any doubts on that score would be settled by American voters, should he ever be nominated for the Presidency.
So while the courts have never ruled on a case to define who is a natural born citizen of the United States, the people have resolved that ambiguity in at least one case.
The Fincher citation is taken from Charles Gordon, Who Can Be President Of The United States: The Unresolved Enigma, 28 MD L. Rev. 1, 1 (1968)