Donald Trump remains firmly ensconced as the Republican front-runner, the only candidate with a mathematically plausible path to clinching the nomination on the first ballot. Yet his candidacy is leaving the party so divided that its nomination may not be worth much come November.

Consider one poll number that is on the surface encouraging for Trump: 54 percent of Republicans told Monmouth University that the Republican National Convention should nominate him if he has the highest delegate count, even if it is less than an absolute majority.