The year 2016 probably won’t go down as one of America’s great democratic moments, but maybe voters are wiser than their leaders. A growing body of polling evidence suggests that in a race between Donald Trump and Hillary Clinton, the candidacy of “neither” would win, perhaps in a rout.

A Monmouth University national survey published Monday asked whether voters had a favorable opinion of the Democrat, the Republican, both or neither. Some 33% had positive views about Mrs. Clinton only and 24% about Mr. Trump only. An unprecedented...