"The students at the University of California at Berkeley represent a diverse array of students from all walks of life," begins the student petition. Somehow you just know that before the end, the document will demand that the administration muzzle someone -- for the sake of diversity. The spirit of far-left censors trumps exposure to novel ideas. Hence the petition, titled "Stop Bill Maher from speaking at UC Berkeley's December graduation." "It is the responsibility of the University of California to protect all students and uphold a standard of civility," quoth the petition, which has gathered more than 4,000 signatures....