NEWPORT BEACH, California\u2014Last month, at a politically themed chili cook-off in Huntington Beach, Sandy Metcalf\u2019s manila folder went missing. The folder contained copies of documents alleging Hans Keirstead, a neuroscientist running for Congress in California\u2019s 48th District, had slept with his graduate students and, in one case, had punched one of them in a boozy incident following a concert.