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Democratic Presidential candidate Bernie Sanders speaks during a rally at the Boston Convention and Exhibition Center October 3, 2015 in Boston, Massachusetts.
Democratic Presidential candidate Bernie Sanders speaks during a rally at the Boston Convention and Exhibition Center October 3, 2015 in Boston, Massachusetts.

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What's at stake for Bernie?

Bernie Sanders' debate night strategy: his Iraq war vote, distinctions with Hillary Clinton, and what he will and won't do on Tuesday night.

What's at stake for Bernie?

Bernie Sanders' debate night strategy: his Iraq war vote, distinctions with Hillary Clinton, and what he will and won't do on Tuesday night.