Jeff Nussbaum, political speechwriter, discusses his new book "Undelivered: The Never-Heard Speeches That Would Have Rewritten History," kennedy, library, history, politics, government, jfk, forum which explores the context of undelivered speeches by notable figures including Presidents Kennedy, Eisenhower, and Nixon; John Lewis, Hillary Clinton, and Condoleeza Rice. Mark Arsenault, reporter at The Boston Globe, moderates.