Not one.
Every historian, every constitutional lawyer, every constitutional law professor, every politician, every party functionary -- and all of the politically-aware citizens -- knew from the time of his announcement that Barack Obama's daddy had been born in Kenya. And was, thus, a British subject and, subsequently, a citizen of Kenya. And that he was in the USA on a student visa when he fathered Barack Obama II.
Barack Obama II was even at pains to tell us all this in his books.
Yet, nobody, absolutely nobody, nary a one of these acknowledged and "well-educated" experts raised a solitary question about Obama's eligibility for the office of President of the United States.
Why would that be, do you suppose?
Could it be because, under the known circumstances, he was, in fact, eligible?
Or was it a grand conspiracy, organized by the almight "they"? Or was everybody -- literally everybody -- paralyzed by Obama's semi-blackness?
Occam's Razor supports the notion that it's the former...
The "dog that did not bark" proves nothing.
I have long become accustomed to "experts" being both ignorant and wrong.