The Harris/Walz campaign says it learned about Ms. Swift’s statement at the same time the rest of us did, though the fact that it wasted less than an hour before selling Swiftian friendship bracelets left a different impression. Regardless, Ms. Swift has a history of thinking long and hard before lending her name to a cause.

Sports, politics and pop music collided when Taylor Swift endorsed Kamala Harris. Here's what it means to voters at Sunday's Chiefs game.