On the first Tuesday in November, two uniformed men arrived at a voting place and took up positions by the entry doors. In the hours that followed, they harassed voters and election officials, hurled racial epithets and physically blocked persons of other races who sought to cast their votes for president of the United States. One of the men brandished a nightstick. Bartle Bull, a civil rights movement veteran, was there. He says it was "the most blatant form of voter intimidation I have encountered in my life in political campaigns in many states, even going back to the work...