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    Bernie Sanders joins Hillary Clinton to beat Trump

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Bernie Sanders joins Hillary Clinton to beat Trump

Sen. Bernie Sanders officially endorsed presumptive Democratic nominee Hillary Clinton, saying he is teaming up with his primary rival to defeat Donald Trump. CNN's Jeff Zeleny reports.

Bernie Sanders joins Hillary Clinton to beat Trump

Sen. Bernie Sanders officially endorsed presumptive Democratic nominee Hillary Clinton, saying he is teaming up with his primary rival to defeat Donald Trump. CNN's Jeff Zeleny reports.