Sen. Kamala Harris Kamala HarrisHundreds of lawyers from nation's oldest African American sorority join effort to fight voter suppression Biden picks up endorsement from progressive climate group 350 Action 3 reasons why Biden is misreading the politics of court packing MORE (D-Calif.) raised close to $12 million from 279,000 donors in the second quarter, well below the amount brought in by former Vice President Joe Biden Joe BidenPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Hillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Fox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio MORE and Sen. Bernie Sanders Bernie SandersThe Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power Bernie Sanders: 'This is an election between Donald Trump and democracy' The Hill's 12:30 Report: Trump stokes fears over November election outcome MORE (I-Vt.).

Nearly 150,000 of Harris's contributors were new donors, according to her campaign.

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The average contribution in the second quarter was $39. Harris brought in $7 million through her digital program, with an average online donation of $24, her campaign said.

The new quarterly figures bring Harris's total fundraising to $23 million.

Harris's fundraising trails that of Biden, Sanders and South Bend, Ind., Mayor Pete Buttigieg Pete ButtigiegBillionaire who donated to Trump in 2016 donates to Biden The Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November Buttigieg stands in as Pence for Harris's debate practice MORE (D).

Buttigieg brought in $24.8 million during the second quarter, followed by Biden who raised $21.5 million. Sanders raked in $18 million during that time period.

Biden and Buttigieg launched their campaigns in April.

Harris was thrust into the spotlight last week after she confronted Biden on his civil rights record at the first Democratic primary debate.

She has since seen a jump in the polls, while Biden appears to be slipping.

A Reuters/Ipsos poll released Wednesday found that Biden's support had fallen to 22 percent from 30 percent, while Harris overtook Sen. Elizabeth Warren Elizabeth WarrenHillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline Democratic senators ask inspector general to investigate IRS use of location tracking service MORE (D-Mass.) for third place.