Important WaPo oped from Peter Wagner: ” Sandwiched between its controversial immigration, campaign finance and health-carerulings last month, the Supreme Court issued a little-noticed decision in a Maryland case that gave the green light to states to eliminate the repugnant practice of ‘prison-based gerrymandering.’ States are now unquestionably free to correct for an ancient flaw in the U.S. Census that counts incarcerated people as residents not of their homes but of the places where their prisons are located. When the prison population was small, the problem was little more than statistical trivia. Today, however, the census counts more than 2 million people as though they were residents of places where they have no community ties.”