Trump was winning handily with more than 45 percent of the vote and nearly 90 percent of the results counted, to about 23 percent for Rubio and about 22 percent for Cruz. Trump won with every demographic, exceeding Cruz with evangelicals and beating Rubio with more moderate Republicans. It was a complete rout, and once again, Trump showed he was the only candidate with a coalition that can carry him through the entire primary, bringing working-class whites together with conservative evangelicals and Republican moderates. Indeed, Trump is poised to dominate in next week’s Super Tuesday primaries, where he leads in...