Members of the Chicago Teachers Union distribute strike signage at the Chicago Teachers Union strike headquarters on Saturday, Sept. 8, 2012 in Chicago. The union has vowed to strike on

 

              Members of the Chicago Teachers Union distribute strike signage at the Chicago Teachers Union strike headquarters on Saturday, Sept. 8, 2012 in Chicago. The union has vowed to strike on
Members of the Chicago Teachers Union distribute strike signage at the Chicago Teachers Union strike headquarters on Saturday, Sept. 8, 2012 in Chicago. The union has vowed to strike on Monday, Sept. 10, 2012, should it fail to reach an agreement over teachers' contracts with Chicago Public Schools by that date. (AP Photo/Sitthixay Ditthavong)