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In a release, Team Clinton touted the month as Clinton's "best grassroots fundraising month of the campaign." It noted that more than 50 percent of the $30 million came from "grassroots donations."

The former secretary of State entered March with $31 million in cash on hand.

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"We continue to beat every fundraising goal and, more importantly, make smart and efficient investments," campaign manager Robby Mook said in a statement. "Grassroots support is truly powering this campaign as the majority of our fundraising came from online donations."

Clinton announced the total after she won seven of the 11 states on Super Tuesday, increasing her delegate lead over Sanders.

The Sanders campaign advertised the quest for $40 million in the last days of the month, setting up a page to show the donations pouring in from largely online sources. More than $5.5 million of that came in the final day of the month.

A Sanders campaign spokesperson did not return a request for the campaign's cash on hand after its February haul.