Teachers' unions find themselves on the defensive in states across the country, as governors and lawmakers press forward with proposals to target job protections and benefits that elected officials contend the public can no longer afford academically or financially. Many of those efforts are being driven by newly elected Republicans, who have…

A strike last week by some 29,000 teachers in Chicago pushed long-simmering tensions over deeply divisive school improvement ideas--including changes in teacher evaluation and the takeover or closure of underperforming schools--into the national spotlight. A framework for a tentative agreement emerged last Friday, and the union's house of…