RealClearPolitics election analyst Sean Trende has come under coordinated red-hot rhetorical fire from the Left for his thesis that one of the major causes of Mitt Romney’s loss in 2012 was that a disproportionate number of white voters – mostly downscale whites outside the South – stayed home. Much of the criticism of Trende’s thesis is based on deliberately misreading his policy prescriptions – but it’s also based on a simpler failure to grasp the basic math behind his calculations. Like any exercise in reading exit polls and census data, Trende’s assumptions (which he lays out explicitly) can be critiqued...