Donald Trump’s easy victory in South Carolina over Nikki Haley on Saturday was another large stride toward his third Republican presidential nomination. But the results also revealed that the former President presides over a divided party, and the fault isn’t Ms. Haley’s.
Mr. Trump’s victory again proved that he clearly is the favorite of most GOP partisans, as the exit poll shows he dominated with most party groups. His 20-point or so victory shows how much he now dominates the GOP, even if his vote share did underperform what most polls had predicted. Democrats could…
