On a bright August morning in the quiet waterfront town of Edenton, N.C., Artur Davis, a black former congressman from Alabama, looked out at a sea of beaming white faces and grinned. “I’m gonna let you all in on a secret,” he said. “I used to be a Democrat!” Lusty boos dissolved into chuckles. “He saw the light!” someone shouted. Davis nodded. “I once was lost, but now I am found!”

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