In Iowa, 49% of Republican caucusgoers backed someone other than Donald Trump. In the New Hampshire primary, the non-Trump vote was 46%. In South Carolina, the state's former governor, Nikki Haley, won the backing of 4 in 10 voters.
Those dissenters are not enough to stop Trump. Barring some unforeseen calamity — say a major health or legal setback — the former president will be the Republican nomi…