The Democratic presidential nominee said he has now received donations from more than four million people.
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The cash bump comes during a month in which Biden named California Senator Kamala Harris as his running mate and the Democrats conducted their convention.
In July, Biden and the Democrats took in $140 million, compared to President Donald Trump’s haul of $165 million.
Biden has been closing the fundraising gap with the Republican president, who in recent years has been particularly successful in raking in cash from donors.