Public school teachers cheer as Chicago Teachers Union President Karen Lewis, unseen, arrives unexpectedly to address a rally of thousands of teachers gathered for the second consecutive day 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
Public school teachers cheer as Chicago Teachers Union President Karen Lewis, unseen, arrives unexpectedly to address a rally of thousands of teachers gathered for the second consecutive day 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)
Public school teachers cheer as Chicago Teachers Union President Karen Lewis, unseen, arrives unexpectedly to address a rally of thousands of teachers gathered for the second consecutive day 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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