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Bernie Sanders speaks to members of the press before being introduced at the Allen Temple Baptist Church in Oakland, California on May 30, 2016.
Bernie Sanders speaks to members of the press before being introduced at the Allen Temple Baptist Church in Oakland, California on May 30, 2016.

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    It's 'Bernie or bust' for some Sanders supporters

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It's 'Bernie or bust' for some Sanders supporters

Die-hard Bernie Sanders supporters vow to stay true to the Vermont senator and insist they will not support Hillary Clinton if she wins the Democratic presidential nomination. CNN's Jeff Zeleny reports.

It's 'Bernie or bust' for some Sanders supporters

Die-hard Bernie Sanders supporters vow to stay true to the Vermont senator and insist they will not support Hillary Clinton if she wins the Democratic presidential nomination. CNN's Jeff Zeleny reports.