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Main story: Republican National Convention; plus, 2016 Democratic Vice Presidential selection Tim Kaine; Boris Johnson named Britain's foreign secretary; And Now: A Summary of Roger Ailes' Contribution to our Political Discourse; campaign songs with special appearances by Michael Bolton, Sheryl Crow, Josh Groban, Cyndi Lauper, John Mellencamp, Usher Raymond IV, Dan Reynolds, Ann Wilson, Nancy Wilson.