Lynn Vavreck for NYT’s The UpShot:

According to P.P.P., 70 percent of Mr. Trump’s voters in South Carolina wish the Confederate battle flag were still flying on their statehouse grounds. (It was removed last summer less than a month after a mass shooting at a black church in Charleston.) The polling firm says that 38 percent of them wish the South had won the Civil War. Only a quarter of Mr. Rubio’s supporters share that wish, and even fewer of Mr. Kasich’s and Mr. Carson’s do.

Nationally, the YouGov data show a similar trend: Nearly 20 percent of Mr. Trump’s voters disagreed with the freeing of slaves in Southern states after the Civil War. Only 5 percent of Mr. Rubio’s voters share this view.