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Man, back home in united states. public pleas and secret meetings led to his release. now were learning more ab the diplomacy and deal making done behind closed doors that led to grosss freedom and a monumental shift in u.s. policy. our chief national security correspondent jim sciutto has more for you. >> carol, this is a truly remarkable piece of diplomacy conducted in secret over more than a year and a half in multiple countries, principally canada and the vatican and somehow kept secret unti...