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WASHINGTON, D.C. (CBSMiami/AP) — While President Barack Obama isn’t ready to urge Democratic candidate Bernie Sanders to exit the party’s primary, he did suggest the Vermont senator’s prospects are slim.

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Asked whether he think Sanders should call it quits, Obama says “let’s let the process play itself out.” But he added “I think everybody knows what the math is.” He said Sanders has done an “extraordinary job” raising important issues.

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Rival Hillary Clinton holds a sizable lead over Sanders with more than 300 pledged delegates and has received about 3 million more votes than Sanders during the primaries. Including superdelegates Clinton is more than 90 percent of the way to clinching the nomination.

Obama has said he plans to campaign hard for the nominee, once the party has rallied around a single candidate.

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