This week on dialogue an interview with the father-daughter journalist team of Marvin and Debbie Kalb, who just finished a book on the legacy of Vietnam.  They discuss how the war has affected every American administration since its conclusion and examine the continuing debate of when the United States should go to war. Deborah Kalb, a freelance writer and editor, worked as a journalist in Washington for two decades, including writing for Gannett News Service, Congressional Quarterly, U.S. News & World Report, and The Hill.  Marvin Kalb is the Edward R. Murrow professor of Practice Emeritus at Harvard’s Kennedy School of Government and founding director of the Shorenstein Center on the Press, Politics, and Public Policy. His award winning journalism career included stints as a Moscow bureau chief and as host of Meet the Press.