WASHINGTON, D.C.-In the summer of 2004, CIA agent Theodore J. Higginbothem III was summoned by his boss to a hush-hush meeting in the basement of the National Museum of Health. "Higgy," his boss whispered in his ear, "the CIA has a top-secret, off-the-books domestic spying operation in which we keep tabs on our most ambitious presidential hopefuls. I want you to do a complete workup on Barack Hussein Obama. Where was he born? Is he a Muslim? Is he...