Lori Lightfoot did something during her victory party last week that once would have been considered obscene. As Chicago's beaming mayor-elect stood at a podium, she turned toward her wife, Amy Eshleman, and kissed her in full view of a roomful of jubilant supporters while photographers snapped away. The images of that moment looked like a sneak preview of a New America breaking through -- a black, gay woman kissing her white wife before a mini-rainbow coalition of onlookers. And nobody raised an eyebrow. But focus on just the black supporters in that room and another image emerges. The black...