Chicago Teachers Union President Karen Lewis is embraced by a teacher during an unexpected appearance at a rally of thousands of public school teachers outside the Chicago Board of Education district headquarters on Tuesday, Sept. 11, 2012 in Chicago. Teachers walked off the job Monday for the first time in 25 years over issues that include pay raises, classroom conditions, job security and teacher evaluations. (AP Photo/Sitthixay Ditthavong)

Associated Press
Chicago Teachers Union President Karen Lewis is embraced by a teacher during an unexpected appearance at a rally of thousands of public school teachers outside the Chicago Board of Education district headquarters on Tuesday, Sept. 11, 2012 in Chicago. Teachers walked off the job Monday for the first time in 25 years over issues that include pay raises, classroom conditions, job security and teacher evaluations. (AP Photo/Sitthixay Ditthavong)
Chicago Teachers Union President Karen Lewis is embraced by a teacher during an unexpected appearance at a rally of thousands of public school teachers outside the Chicago Board of Education district headquarters on Tuesday, Sept. 11, 2012 in Chicago. Teachers walked off the job Monday for the first time in 25 years over issues that include pay raises, classroom conditions, job security and teacher evaluations. (AP Photo/Sitthixay Ditthavong)
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