Chicago Teachers Union President Karen Lewis speaks at a news conference following a meeting of CTU delegates Sunday, Sept. 16, 2012 in Chicago. The Chicago teachers union decided Sunday to continue its weeklong strike, extending an acrimonious standoff with Mayor Rahm Emanuel over teacher evaluations and job security provisions central to the debate over the future of public education across the United States. (AP Photo/Sitthixay Ditthavong)

Associated Press
Chicago Teachers Union President Karen Lewis speaks at a news conference following a meeting of CTU delegates Sunday, Sept. 16, 2012 in Chicago. The Chicago teachers union decided Sunday to continue its weeklong strike, extending an acrimonious standoff with Mayor Rahm Emanuel over teacher evaluations and job security provisions central to the debate over the future of public education across the United States. (AP Photo/Sitthixay Ditthavong)
Chicago Teachers Union President Karen Lewis speaks at a news conference following a meeting of CTU delegates Sunday, Sept. 16, 2012 in Chicago. The Chicago teachers union decided Sunday to continue its weeklong strike, extending an acrimonious standoff with Mayor Rahm Emanuel over teacher evaluations and job security provisions central to the debate over the future of public education across the United States. (AP Photo/Sitthixay Ditthavong)
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