Police departments in cities across the country are beefing up their ranks for Election Day, preparing for possible civil unrest and riots after the historic presidential contest. Public safety officials said in interviews with The Hill that the election, which will end with either the nation’s first black president or its first female vice president, demanded a stronger police presence. Some worry that if Barack Obama loses and there is suspicion of foul play in the election, violence could ensue in cities with large black populations. Others based the need for enhanced patrols on past riots in urban areas (following...