Karen Lewis, president of the Chicago Teachers Union, smiles Sept. 18, 2012, as she talks with reporters in Chicago after the union's House of Delegates voted to suspend a seven-day strike. (Associated Press)

Photo by: Charles Rex Arbogast

Karen Lewis, president of the Chicago Teachers Union, smiles Sept. 18, 2012, as she talks with reporters in Chicago after the union's House of Delegates voted to suspend a seven-day strike. (Associated Press)