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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: We still have a narrow path to victory

Presidential candidate Bernie Sanders speaks to CNN's Jake Tapper after winning the Indiana Democratic primary.

Sanders: We still have a narrow path to victory

Presidential candidate Bernie Sanders speaks to CNN's Jake Tapper after winning the Indiana Democratic primary.