Stanley Greenberg, one of the nation’s best-respected pollsters and political consultants, will be at Wagner on Feb. 25 to discuss his just-published book, “Dispatches from the War Room: In the Trenches with Five Extraordinary Leaders.”  Based on his work with US President Bill Clinton, South African President Nelson Mandela, British Prime Minister Tony Blair, Israeli Prime Minister Ehud Barak, and Bolivian President Gonzalo Sanchez de Lozada, Greenberg will share personal experiences as well as insightful reflections on leadership, democracy, and the (blurred) lines between campaigning and governing.