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MSNBC's 'Big Board' map guru Steve Kornacki gets a new nickname

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MSNBC’s Steve Kornacki and hip hop legend Fab 5 Freddy join MSNBC’s Ari Melber for Fallback Friday, an irreverent segment on “The Beat,” discussing the Olympics, aging and even a new nickname for Kornacki - "Grandmaster Math," a tribute to Grandmaster Flash.