In the waning days of the worst January any of us can remember, I desperately wanted to tell a good story about America, and then on Friday, I watched one unfold in frozen Minnesota with an abiding love and white-hot intensity that seemed to melt the subzero air. The sight of as many as 50,000 people packing the downtown streets on a minus-9-degree day to demand that federal immigration raiders leave Minneapolis was a high watermark for a pro-democracy movement that refuses to obey the autocracy of Donald Trump. I was especially moved by the images of a polyglot of...