There was a time when the Chicks were best known for their music, but since 2003—when they dissed George W. Bush on a London stage and were all but tarred and feathered by the Nashville establishment—their mere presence has been an inherently political thing. For years, the brand was the public face of left-leaning country music, and though these days they are joined by the likes of Maren Morris, Kacey Musgraves, Mickey Guyton, and the Hill-McGraw couple, the Chicks were the original proudly, loudly liberal country artists. So it was a no-brainer to have them perform at the Democratic National Convention, which they did this Thursday. The trio of Texas natives—Natalie Maines, Martie Maguire, and Emily Strayer—sang the national anthem before Kamala Harris, now officially the…