Not sure who you are calling a crackpot, but this:
1952 The Immigration and Nationality Act of June 27, 1952, 66 Stat. 163, 235, 8 U.S. Code Section 1401 (b). (Section 301 of the Act).
"Section 301. (a) The following shall be nationals and citizens of the United States at birth:
"(1) a person born in the United States, and subject to the jurisdiction thereof;
"(7) a person born outside the geographical limits of the United States and its outlying possessions of parents one of whom is an alien, and the other a citizen of the United States, who prior to the birth of such person, was physically present in the United States or its outlying possessions for a period or periods totaling not less than ten years, at least five of which were after attaining the age of fourteen years."
means that Obama should produce his BC and prove he was born in the US.