Chicago Teachers Union members picket prior to a Chicago Board of Education meeting on Wednesday, Aug. 22, 2012 in Chicago. The union called for fair contracts with higher pay for its teachers. (AP Photo/Sitthixay Ditthavong)

Chicago Teachers Union members picket prior to a Chicago Board of Education meeting on Wednesday, Aug. 22, 2012 in Chicago. The union called for fair contracts with higher pay for its teachers. (AP ... more
Chicago Teachers Union members picket prior to a Chicago Board of Education meeting on Wednesday, Aug. 22, 2012 in Chicago. The union called for fair contracts with higher pay for its teachers. (AP Photo/Sitthixay Ditthavong) less

Yahoo! Finance