NEW YORK -- The fight over how to measure the state's teachers made its way to court this week, with New York's largest teachers' union suing the Board of Regents and the state education commissioner over new teacher evaluation regulations."For us to do other than this -- we have 600,000 members -- would give me very little credibility with my own members," New York State United Teachers President Richard Iannuzzi told The Huffington Post.On Monday, NYSUT filed a complaint, alleging that the Board of Regents overstepped its bounds in adapting a new teacher evaluation plan.