It’s a reasonable assumption then that Trump will need at least 60 million votes to win the White House this fall — and almost certainly north of 65 million given population growth in the country.

That’s about five times the number of votes he received in the primary. Much of that difference will be made up by the fact that lots of Republicans simply don’t vote in GOP primaries but will almost certainly turn out in a general election — even if it’s only to cast a vote against Hillary Clinton.

But, assuming what worked to win 13 million votes is a sure-fire recipe for winning five times that number seems to be a decidedly shaky proposition.

Why? Because we know from recent presidential history that the electorate of a Republican primary is whiter and older — by a considerable amount — than the general electorate.