Amanpour: Judea Pearl, Mariana Mazzucato, Stuart Stevens and Jon Batiste

As Pakistan's Supreme Court orders the release of the four men accused and previously convicted of the murder of American journalist Daniel Pearl in 2002, Christiane Amanpour is joined by his father Judea Pearl to reflect on the loss of his son and getting justice. Economist Mariana Mazzucato talks about her new book "Mission Economy" and how the public and private sectors must collaborate to tackle the world's big problems. Then former Republican consultant and author of "It Was All a Lie", Stuart Stevens , says unless the GOP changes, the long term trend is bad for the Republican party. Our Michel Martin talks to Grammy nominated composer, singer and pianist Jon Batiste about making the music behind “Soul”, his activism and new album "We Are."

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