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New CNN poll shows the importance of debates for contenders

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A brand new CNN poll is proving just how crucial Democratic debates can be. NBC’s Steve Kornacki joins Chris Jansing to break down which candidates are getting post-debate bumps – at the expense of Joe Biden. Weighing in: University of Texas Professor Victoria DeFrancesco, former RNC Chairman Michael Steele, Bloomberg Opinion Executive Editor Tim O’Brien, and NBC’s Shaquille Brewster.