Amanpour: Mark Sanford, Lily Tomlin, Jane Wagner and Paul Tough

U.S. Republican presidential candidate Mark Sanford joins Christiane Amanpour to discuss his campaign, and his challenge to U.S. President Trump. Actress Lily Tomlin, and her partner, producer Jane Wagner, talk about their personal and professional partnership, and their new Lincoln Center retrospective, "Two Free Women". Our Michel Martin speaks to author Paul Tough, whose new book "The Years that Matter Most", examines how the university system is still weighted in favor of the wealthy.

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