As his presidential campaign sputtered, Sen. Tim Scott, R-S.C., could sound like a candidate unstuck in time. In June, he spent days responding to a dismissive comment from Barack Obama questioning his commitment to racial justice, saying America was a “land of opportunity, not a land of oppression.” In September, he rolled out an “empower parents” plan by explaining that children “need the ABCs, not CRT.” Wherever he campaigned, he invoked his race and biography as the ultimate rebuke to race-obsessed progressives fixated on a “culture of grievance” instead of personal achievement: “My life disproves their lie.” Republican primary voters,...