Pop superstar Taylor Swift did something she has resisted doing in the past, taking sides in a political fight. The singer posted a message on Instagram to blast Tennessee GOP Senate candidate Marsha Blackburn and endorse her Democratic opponent, Phil Bredesen.

Swift’s “first big jump into politics might have gained her some extra haters, but her endorsement in a competitive midterm U.S. Senate race isn’t likely to result in a massive backlash against the country-singer-turned-pop-star, observers say,” the AP reports, noting that “Republicans now have some bad blood with the star” after her surprise endorsement.

Swift writes in her Instagram post: “As much as I have in the past and would like to continue voting for women in office, I cannot support Marsha Blackburn. Her voting record in Congress appalls and terrifies me. She voted against equal pay for women. She voted against the Reauthorization of the Violence Against Women Act, which attempts to protect women from domestic violence, stalking, and date rape. She believes businesses have a right to refuse service to gay couples. She also believes they should not have the right to marry. These are not MY Tennessee values. I will be voting for Phil Bredesen for Senate and Jim Cooper for House of Representatives.”

You can click here to read her full message, or here to go to her Instagram page.

“Republicans and President Donald Trump have already rebuked her for the endorsement, but the Swifties closed ranks in support of her and many others have applauded her for speaking out,” the AP reports.

The AP quotes Beverly Keel, chair of the department of recording industry at Middle Tennessee State University, saying of Swift: “She weighs every word carefully, but she has to because few artists receive more scrutiny than she does. People will analyze every single word.”

Swift’s Instagram message was accompanied by a Polaroid-style selfie, which you can see below.