Voter registration spiked in the 48 hours since President Joe Biden officially stepped down from his candidacy for reelection and endorsed Vice President Kamala Harris, according to the nonpartisan voter registration site Vote.org.

“We registered nearly 40,000 voters — an almost 700% daily increase in new registrations,” CEO Andrea Hailey posted on X, formerly Twitter, Wednesday morning. “That’s the largest number of new voters registered over a 48 hour period we’ve seen this entire cycle.”

The largest demographic signing up: people aged 18-34, according to the nonprofit organization.

That’s even more than the more than 35,000 new registrations that Taylor Swift inspired last September when she urged her fans to register.

Get-out-the-vote campaigns also surged elsewhere. While the presidents of the National Pan-Hellenic Council — also known as the Divine Nine, an umbrella organization for nine historically Black fraternities and sororities — did not endorse Harris Monday, they did announce a “massive coordinated voter mobilization campaign.”

“We, the Council of Presidents of the National Pan-Hellenic Council (Divine 9), have met and agreed to meet this critical moment in history with an unprecedented voter registration, education and mobilization coordinated campaign” to ensure strong turnout, the council said in a release on Facebook. “The Divine 9 stands in unity to Get Out The Vote. We are stronger together.”