CHICAGO – After lobbying in parking lots, allegations of vote manipulation and a shouting match that ended with a hug, Mayor Rahm Emanuel has persuaded just 13 out of hundreds of Chicago schools to break with their union and accept cash in exchange for lengthening the school day for the city's students. But the teachers union has cried foul and wants the schools to be forced to return to their old schedules. The Illinois Educational Labor Relations Board will take up the issue Thursday when it considers a union appeal to block the longer school day from taking effect pending...