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What's at stake for Bernie Sanders and Joe Biden in tonight's Democratic primaries

More than 350 delegates are at stake in tonight's Democratic primaries across six states. CBSN political reporter Caitlin Huey-Burns, CBS News correspondent Nikole Killion, CBS News political director Caitlin Conant, and Adam Brewster, a CBS News campaign reporter covering Michigan, spoke to CBSN's Elaine Quijano ahead of the polls closing.
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