Robert Laurence `` Bob '' Barr , Jr. ( born November 5 , 1948 ) is the Libertarian Party nominee for President of the United States in the 2008 election . He is a former federal prosecutor and a former member of the United States House of Representatives . Robert Laurence `` Bob '' Barr , Jr. ( born November 5 , 1948 ) is a former federal prosecutor and a former member of the United States House of Representatives .