Trump Not Benefiting from Economic Boom

President Donald Trump is showing that it's possible to preside over a period of peace and prosperity and still be notably unpopular.

Over the past several months, Trump has opened even more of a wedge between the largely benign material conditions in the country and his own political standing, which is precarious and appears to be sliding backward. This isn't how it's supposed to work.

Republican politicos believed, reasonably enough, that last year's tax cuts would stoke growth and create a good-news backdrop for Republicans in the midterms. The substantive part of this theory has worked swi...