Chicago Teachers Union President Karen Lewis takes a break from negotiations with the Chicago Board of Education to make an unexpected appearance at a rally of thousands of public school teachers 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 takes a break from negotiations with the Chicago Board of Education to make an unexpected appearance at a rally of thousands of public school teachers 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 takes a break from negotiations with the Chicago Board of Education to make an unexpected appearance at a rally of thousands of public school teachers 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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