This episode's headline: Changing Course; Shaken Faith; Political Wrap. The guests include ROBERT LEGVOLD, Political Scientist; PADMA DESAI, Economist; VLADISLAV DROBKOV, Pravda; JEFFREY SACHS, Former Russian Government Adviser; MARK SHIELDS, Syndicated Columnist; PAUL GIGOT, Wall Street Journal; ANN LEWIS, Democratic Political Consultant; CORRESPONDENTS: IAN WILLIAMS; SPENCER MICHELS. Byline: In New York: ROBERT MacNeil; In Washington: JAMES LEHRER