A melancholy, tinkling piano melody served as the soundtrack for Nikki Haley’s announcement that she was running for US president in 2024. She declared her candidacy on Twitter in a video that places her in her hometown of Bamberg, South Carolina: thick with trees, a wide boulevard, roomy houses. When Ms Haley appears, she’s walking alongside the railroad tracks that, she says, divided Bamberg by race when she was growing up. Read More That division was between black and white. And Haley, who is the daughter of Indian immigrants, didn’t fit into either category. “I was different,” she says in...