Biden’s exit leads to the biggest day for Democratic donations online in years — $30 million and counting.

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As Vice President Kamala Harris built momentum to claim the nomination, Democrats went online to contribute at a startling pace.

Democrats greeted President Biden’s departure from the presidential race with an avalanche of cash, donating more than $30 million online on Sunday and making it the single biggest day for online Democratic contributions since the 2020 election — with hours still to go.

The massive amount is based on a New York Times analysis of the online ticker of contributions maintained by ActBlue, the leading site processing Democratic donations.

With Mr. Biden gone and Vice President Kamala Harris building momentum to claim the nomination, Democrats went online to contribute at a startling pace. Donations spiked from an average of less than $200,000 per hour in the hours before Mr. Biden quit to $7.5 million in a single hour later on Sunday, the analysis shows.

The ActBlue ticker accounts for all donations made on the platform, not just those made to Mr. Biden or Ms. Harris, but also those made to nearly every Democratic House and Senate candidate and to an array of politically minded nonprofits.

“This might be the greatest fundraising moment in Democratic Party history,” wrote Kenneth Pennington, a Democratic digital strategist, on X.

The previous single biggest day for donations on ActBlue came the day after Justice Ruth Bader Ginsburg passed away in September 2020. ActBlue processed roughly $73.5 million that day. It is one of only two days the platform ever surpassed $50 million in donations.

The latest deluge is significant as the party seeks to recover from a month of political infighting and stalled momentum in the race against former President Donald J. Trump. Party fund-raising had slowed considerably among major Democratic donors in the weeks after Mr. Biden’s poor debate performance.

Shane Goldmacher is a national political correspondent, covering the 2024 campaign and the major developments, trends and forces shaping American politics. He can be reached at [email protected]. More about Shane Goldmacher