“It’s a huge voter block—and not only that, but it’s a voter block that we’ve seen be consequential with regards to elections, particularly with Donald Trump,” Collins said.

How Swift’s endorsement will shape the election remains to be seen, but its impact is already evident. The General Services Administration told ABC News that, as of 2:00 p.m. on Wednesday, more than 330,000 people had visited the voter registration site linked by Swift.

Shortly after Swift’s endorsement, a spokesperson for the vice president said Harris was “very proud” to have the singer’s support and mentioned it came as a complete surprise.