On Sunday night, Chicago Teachers Union President Karen Lewis, right, tells reporters outside the union's headquarters that the city's 25,000 public school teachers will walk the picket line Monday morning.
A large group of Chicago public school teachers marches past John Marshall Metropolitan High School on Wednesday on the city's West Side.
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She's brash and blunt, the tough-talking union leader who has taken on Chicago Mayor Rahm Emanuel in a bitter contract dispute regarded as a referendum on the future of the nation's third-largest school district. But Karen Lewis is also a whip-smart Ivy League graduate with a long, distinguished record in the classroom and the overwhelming support of her union's 30,000 members.