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The Big Question: Will the third debate change the idea that this is a 3-candidate race?

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The third Democratic Debate is approaching. With 10 candidates left on stage, will tonight change the narrative that this is really a three candidate race? NBC Road Warriors Ali Vitali, Mike Memoli and Garrett Haake join Katy Tur from Houston to discuss. PLUS: A conversation with the national co-chair for the Sanders campaign, Nina Turner.