“There is very little statistical evidence that millions of Conservatives stayed home in 2012.”
The fact that MR only got 1m more than JM is proof millions of conservatives stayed home in 2012.
Population growth?
No - the number of white people in America grows very slowly each year.
And, the older white voters who died were much more Conservative than the young white voters who replaced them.
And, what happened to the 4.5 million white voters who deserted Obama in 2012?