Propaganda, publicity, public relations, spin. These words are really interchangeable but for many, they all evoke somewhat negative connotations. For politicians, the presidents of the United States especially, that's a problem. From the publicity-hungry Theodore Roosevelt to the media-obsessed Richard Nixon to the "no-spin" Barrack Obama, the chief executives have sought to put the appropriate spin on their message to the American people. Listen in as Ernest Granson interviews Rutgers journalism professor, David Greenberg and author of "The Republic of Spin; An Inside History of the American Presidency."