Pressley says Ocasio-Cortez's win is a bellwether for Dems

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MSNBC’s Ayman Mohyeldin interviews Ayanna Pressley, who is running for Congress from Massachusetts’ 7th district against long-time incumbent Rep. Mike Capuano. Pressley is trying to pull off a stunning victory similar to Alexandria Ocasio-Cortez, who defeated Rep. Joe Crowley in New York’s primary.