Taylor Swift, the pop music titan who has been notably apolitical in turbulent political times, broke her silence on Sunday and endorsed two Democratic candidates running for election in Tennessee.

In a post on Instagram, Ms. Swift said she planned to vote for Phil Bredesen, who is competing in a tight Senate race against a Republican candidate backed by President Trump, and Representative Jim Cooper, an incumbent who represents the Nashville area.

“I always have and always will cast my vote based on which candidate will protect and fight for the human rights I believe we all deserve in this country,” Ms. Swift wrote, adding that “I cannot vote for someone who will not be willing to fight for dignity for ALL Americans, no matter their skin color, gender or who they love.”

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Ms. Swift’s political views had previously been left up to interpretation, and at times her silence was viewed as support for Mr. Trump as well as the alt-right movement. The singer is beloved by some white supremacists, who claim her as an Aryan goddess, and in 2017, her lawyers fought back against a blog post that portrayed her as a white supremacist figurehead.