Dan Balz and the Pew Research Center Discover Wage Stagnation

Okay, this one is a bit personal, but it reflects a larger issue. The Pew Research Center just put out a study showing that a declining share of the U.S. population is middle class, with greater percentages falling both in the upper and lower income category than was the case four decades ago. Washington Post columnist Dan Balz touted this declining middle class story as an explanation for the rise of Donald Trump.

The problem here is that there is zero new in the Pew study. My friend and for...