Clinton gets endorsement of largest U.S. labor union

U.S. Democratic presidential front-runner Hillary Clinton, who has been vying with challenger Bernie Sanders for the support of organized labor, scored a win on Saturday with an endorsement from the National Education Association, a huge teachers union. The move makes the NEA, the largest U.S. labor union with 3 million members, the latest in a string of unions to support Clinton, including the American Federation of Teachers and the machinists' union. Clinton's lead in opinion polls has been na