Joe Biden, the Democratic frontrunner has raised $21.5 million since April in his pursuit of the presidency, the second highest of any Democrat.
Biden trails South Bend mayor Pete Buttigieg by more than $3 million.
Buttigieg has raised $24.8 million in the second quarter of 2019, according to campaign fundraising figures.
Biden's campaign started weeks later than Buttigieg's, and his team said the candidate raised more per day than any of his rivals.
Buttigieg was virtually unknown before...
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