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The Bernie Sanders campaign has raised $15 million since April 30, with a total of about 250,000 donors.

The campaign says that the average donation to the Vermont senator and Democratic presidential candidate was about $33 and that 99% of donations were under $250.

Compare that to Hillary Clinton’s announced haul of at least $45 million. The Clinton campaign says that 91% of the donations were under $100, although the overall number of donors isn’t yet known.

The news of Sanders’ fundraising data comes a day after he drew a crowd of 10,000 at a rally in Madison, Wisconsin.

A new poll in Iowa shows that Sanders has doubled his support in the early caucus state, rising from 15 percent in polls in May to 33 percent now.