Democratic presidential candidate Bernie Sanders Bernie SandersKenosha will be a good bellwether in 2020 Biden's fiscal program: What is the likely market impact? McConnell accuses Democrats of sowing division by 'downplaying progress' on election security MORE's campaign has raised nearly $4 million since its weekend victories, the campaign told reporters Monday during a call.

Sanders won elections on Saturday in Washington, Hawaii and Alaska.

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"Reports of our death are extremely exaggerated," Campaign Manager Jeff Weaver said during the call Monday. "Our grassroots funding has been tremendously strong."

Sanders won all three states by a large margin. In the Washington caucuses, Sanders took 72.7 percent to Clinton's 27.1 percent. In Alaska's caucuses, he beat Clinton 81.6 to 18.4 percent. In Hawaii, Sanders won with 69.8 percent of the vote.

On Monday, a top Sanders aide said the Democratic race will hinge on superdelegates.