George Will: Trump's shallowness runs deep

In the 1870s, when Boss Tweed's Tammany Hall controlled New York City, and in the 1950s and 1960s, when Chicago’s Democratic machine was especially rampant, there was a phenomenon that can be called immunity through profusion: Fresh scandals arrived with metronomic regularity, so there was no time to concentrate on any of them. The public, bewildered by blitzkriegs of bad behavior, was enervated.