Chicago Mayor Rahm Emanuel speaks during a news conference at Tarkington School of Excellence in Chicago, Tuesday, Sept. 11, 2012 as Vincent Iturralde, right, principal at at Tarkington listens. Negotiations continue on the second day of a strike in the nation's third-largest school district, as the two sides continue to struggle to reach an agreement in a bitter contract dispute over evaluations and job security. (AP Photo/M. Spencer Green)

Associated Press
Chicago Mayor Rahm Emanuel speaks during a news conference at Tarkington School of Excellence in Chicago, Tuesday, Sept. 11, 2012 as Vincent Iturralde, right, principal at at Tarkington listens. Negotiations continue on the second day of a strike in the nation's third-largest school district, as the two sides continue to struggle to reach an agreement in a bitter contract dispute over evaluations and job security. (AP Photo/M. Spencer Green)
Chicago Mayor Rahm Emanuel speaks during a news conference at Tarkington School of Excellence in Chicago, Tuesday, Sept. 11, 2012 as Vincent Iturralde, right, principal at at Tarkington listens. Negotiations continue on the second day of a strike in the nation's third-largest school district, as the two sides continue to struggle to reach an agreement in a bitter contract dispute over evaluations and job security. (AP Photo/M. Spencer Green)
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