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LOUISVILLE, KY - MAY 3: Democratic presidential candidate Bernie Sanders addresses the crowd during a campaign rally at the Big Four Lawn park May 3, 2016 in Louisville, Kentucky. Sanders is preparing for Kentucky's May 17th primary.    (Photo by John Sommers II/Getty Images)
LOUISVILLE, KY - MAY 3: Democratic presidential candidate Bernie Sanders addresses the crowd during a campaign rally at the Big Four Lawn park May 3, 2016 in Louisville, Kentucky. Sanders is preparing for Kentucky's May 17th primary.    (Photo by John Sommers II/Getty Images)

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    Sanders campaign: Democrats 'court disaster' in Clinton

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Sanders campaign: Democrats 'court disaster' in Clinton

Bernie Sanders' campaign manager Jeff Weaver tells CNN that Democrats are courting disaster if they nominate Hillary Clinton.

Sanders campaign: Democrats 'court disaster' in Clinton

Bernie Sanders' campaign manager Jeff Weaver tells CNN that Democrats are courting disaster if they nominate Hillary Clinton.