Clinton on Thursday attended a fundraiser in Tennessee where she was receiving "checks from high-dollar donors who are bundling as much as $27,000," according to an email sent out to Sanders supporters by campaign manager Jeff Weaver.

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At the same time, Sanders held a town hall with Arizona voters to "talk about the issues that matter," the email said.

On Friday, the candidates have similar schedules. Clinton is fundraising in Virginia, a state that has already voted, and Sanders is holding rallies in the three states that will vote Tuesday: Idaho, Utah and Arizona.

"This is only possible because YOU are Bernie's donors," the email says.

"No millionaires or billionaires to bundle money from their rich friends. Just you."

The Sanders campaign set a goal to raise $5 million by the end of the day Thursday, and the email urged supporters to contribute so Sanders could continue meeting voters.

"So as long as you're with us, Bernie can keep talking to voters to build our political revolution," the email said.