A framed photo on the wall pictures the moment a smiling Biden visited the shop before his turnaround Democratic primary win in 2020. "We think that he's done a wonderful job," says co-owner Christopher Toliver, 53, a viewpoint echoed by customers arriving for early morning appointments at this veritable institution for the city's Black community. Not everyone agrees. A number of polls have shown that Biden is losing ground with the Black voters who propelled him to the White House. Biden has made it clear that South Carolina's first-in-the-nation Democratic primary on Saturday -- which as the incumbent he is...