My latest Bloomberg Opinion column is on Democratic complaints that the political system is rigged against them.

[T]here are two mistakes that dissatisfied Democrats should avoid making.

The first is to assume that they speak for most of the country. Once you’ve made that assumption — as both liberals and conservatives often do — setbacks become proof of a nefarious plot to foil the people’s will. At the same time, persuasion of people who aren’t already in your camp becomes unnecessary.

The popular-vote plurality for Hillary Clinton has helped to feed this illusion on the left. . . .