Taylor Swift endorses Harris

• Swift's endorsement on Instagram, where she has 283 million followers, gained 3.3 million likes in about an hour.

What she's saying: The pop superstar said in the post Harris "fights for the rights and causes I believe need a warrior to champion them" and urged her fans to vote.

• "I think she is a steady-handed, gifted leader and I believe we can accomplish so much more in this country if we are led by calm and not chaos," Swift said of Harris.
• She also said that she was "so heartened and impressed" by her selection of Minnesota Gov. Tim Walz as her running mate, who Swift said "has been standing up for LGBTQ+ rights, IVF, and a woman's right to her own body for decades."

Zoom out: Swift, 34, largely refrained from wading into politics during the beginning of her career.

• During the 2018 midterms, she endorsed two Democrats in her home state of Tennessee ahead of the 2018 midterm elections, marking her ascension into the political fray.
• The Biden campaign had been courting Swift when the president was still the Democratic presidential nominee, hoping that the pop superstar could help him win the coveted youth vote.
• Swift's past comments on politics have helped juice voter registration. Last year, a post she made on Instagram drove record-breaking web traffic to Vote.org at the time, Axios' Stef Kight reported.

Go deeper: "Stick to singing": MAGA backlash against Taylor Swift gets ugly

Editor's note: This story has been updated with additional developments.