Teachers unions are among the most powerful, yet least studied, actors in public education today. Although public attention focuses on the influence of national unions, the policies that most affect teachers and schooling are bargained by local unions and school boards. Interviews with 30 recently elected local union presidents reveal that these leaders balance competing interests and obligations, from the concerns and priorities of their members to pressures from state and national affiliates. Although these presidents reaffirm the traditional union agenda, most also advocate an expanded agenda of teacher professionalism and more collaborative approaches to collective bargaining and contract management. (Contains 1 table and 1 footnote.)