Karen Lewis, president of the Chicago teachers union, departs a news conference after her meeting with the union's House of Delegates Friday, Sept. 14, 2012, in Chicago. Lewis told the delegates that a "framework" was in place to end the teachers strike. (AP Photo/Charles Rex Arbogast)

Photo by: Charles Rex Arbogast

Karen Lewis, president of the Chicago teachers union, departs a news conference after her meeting with the union's House of Delegates Friday, Sept. 14, 2012, in Chicago. Lewis told the delegates that a "framework" was in place to end the teachers strike. (AP Photo/Charles Rex Arbogast)