Joe Biden is reporting that he raised $21.5 million for his presidential campaign in the second quarter. That has the former vice president trailing Pete Buttigieg, who was virtually unknown a few months ago.

Biden's campaign announced his second quarter fundraising total on Wednesday.

Buttigieg, the South Bend, Indiana mayor, reported taking in $24.8 million for the quarter, $3 million more than Biden.

Vermont Sen. Bernie Sanders says he raised $18 million.

Reports to the Federal Election Commission are due July 15.

The numbers will be an indicator of the health of the candidates' campaigns.

Most White House contenders haven't revealed their fundraising numbers.

One day earlier, President Trump's campaign and the Republican National Committee announced that they had raised $105 million during the second fundraising quarter. 

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