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Bernie Sanders says the Democrats are headed for a contested convention because rival Hillary Clinton won't be able to pick up enough pledged delegates, meaning the contest will boil down to the will of the superdelegates

Bernie Sanders says the Democrats are headed for a contested convention because rival Hillary Clinton won't be able to pick up enough pledged delegates, meaning the contest will boil down to the will of the superdelegates. Politico senior Washington correspondent Anna Palmer joins CBSN with more ahead of the latest primary contest in Indiana.

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