They’ve also left rallies with the melody of “Feliz Navidad” stuck in their heads. The adaptation’s repeated opening verse: “Impeachment is the answer.” The day after Mr. Yoon’s ...

Then the AM radio crackled. “Feliz Navidad,” a man sang. “I wanna wish you a merry Christmas, from the bottom of my heart!” My mother hummed along with the melody. That song seemed like a ...