The split

Here, on Tuesday night and since, is a map to ponder: The Idaho split between counties whose Republicans voted for businessman Donald Trump and those who preferred Senator Ted Cruz.

I’ve been trying to align the collection of counties for either candidate with any other kind of lineup, and nothing obvious suggests itself. This may take a little creativity.

There were a dozen Trump counties, scooped out of the center of the state: from the north, Shoshone, Clearwater, Lewis, Idaho, Lemhi, Ad...