Of course, he also has to show he’s for real. Why should these voters trust him? Answering those unspoken doubts is why Trump doubles down on his promises — he’s not just going to build a wall, but make Mexico pay.

First off, it’s funny — always a plus. More, it says he’ll damn well at least get the wall built.

It’s the same for the huge tariffs on Chinese imports and so on: Politicians never deliver everything they promise, but the higher they aim, the more likely you’ll actually get something.

And if you start negotiations with a reasonable offer, you wind up with President Obama’s lousy Iran nuclear deal.

Even Republicans and conservatives who don’t agree on a given issue appreciate Trump’s approach. Partly, it’s that — unlike the pundits and the Washington consultants — they’ve got working-class folks in their towns and in their families. They know how tough it is.