U.S.

Associated Press
In this June 6, 2012 photo, Chicago Teachers Union President Karen Lewis casts her ballot during a strike authorization vote at a Chicago high school. Angered by Mayor Rahm Emanuel’s call for a longer school day and wage and benefit concessions, 25,000 Chicago teachers voted this week to consider authorizing their first strike in a quarter-century.  (AP Photo/M. Spencer Green)

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