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    Clinton campaign memo: Math "impossible" for Sanders

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Clinton campaign memo: Math "impossible" for Sanders

Sen. Sanders pushes back on talk of Clinton locking up the Democratic nomination soon and vows to stay in race. CNN's Jeff Zeleny reports.

Clinton campaign memo: Math "impossible" for Sanders

Sen. Sanders pushes back on talk of Clinton locking up the Democratic nomination soon and vows to stay in race. CNN's Jeff Zeleny reports.