One reason — a secondary reason, perhaps, but not an insignificant one — why Hillary Clinton lost Pennsylvania, Ohio, Michigan and Wisconsin, whose 64 electoral votes were carried by Barack Obama in 2012, was a decline in turnout and Democratic percentage in their major central cities.

The primary reason, as I argued in my Washington Examiner column last week, was the collapse in these states of the Democratic percentage in most counties outside their million-plus metro areas.