Sanders campaign manager: Election isn't over until convention
© Greg Nash

Bernie SandersBernie SandersHuffPost political reporter on why Bernie fell way behind Biden Schumer: Administration 'must move heaven and earth' to implement new unemployment benefits Biden associates reach out to Holder about VP search MORE's campaign manager Jeff Weaver suggested Thursday the Vermont senator would take the race for the Democratic presidential nomination all the way to the party's national convention in July.

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Weaver said the nominating process isn’t over until superdelegates vote at the convention in Philadelphia, even though the last primary contest, in Washington D.C., takes place June 14.

“That’s not the end of the election, frankly, because there are a bunch of superdelegates at the convention who have to vote, so the election is not over when the primary-caucus voting is over,” Weaver said on MSNBC’s “All in with Chris Hayes” Thursday evening.

Sanders hopes to close the gap in pledged delegates in California and New Jersey and sway superdelegates — party leaders who can back any candidate — to support him over Hillary ClintonHillary Diane Rodham ClintonFormer Obama adviser Plouffe predicts 'historical level' of turnout by Trump supporters Poll: More Republican voters think party is more united than Democratic voters Whoopi Goldberg presses Sanders: 'Why are you still in the race?' MORE, the party's front-runner.

Clinton currently leads Sanders by 274 pledged delegates. Including superdelegates, she is 760 delegates ahead of Sanders and just 90 delegates away from the 2,383 needed to clinch the party's presidential nomination.