I suspect they are not angry at all. That explanation better fits the Bernie Sanders campaign for the Democrat nomination which has been strikingly popular too, though not as popular as Trump's. Senator Sanders is winning with university students, who are not really the "working class" he is talking about, and they know it. It's the poor white blokes in baseball caps the senator is talking about, and their wives and children.
But it's the blokes in baseball caps who are turning out for Donald Trump, the most obnoxious of Bernie's "billionaires". No wonder the students were staging anti-Trump confrontations with his supporters - until they realised that, like everything the Republican Party leadership and its acceptable candidates have said and done, like every serious and excoriating analysis of Trump in the press, they were only making him stronger.
As one after the other his rivals have withdrawn from the race, their support did not coalesce against Trump as the pundits and party leaders expected. Trump's pluralities of 35 to 40 per cent turned into majorities of 55 to 60 per cent.
Not that he has wrapped up the nomination; the panellists and maybe even the party doubt he can beat Hillary Clinton in November. Half the voting population, they point out, has not taken part in the primaries. It reminds me of last year when they told us Trump's lead in opinion polls might not necessarily translate into votes once the primaries got under way.
Anyone who takes politics seriously struggles with the thought that, when it comes to the crunch, American voters will elect someone of such wilful ignorance, bullying tendencies and lacking the dignity of their presidency.
But the scale of Trump's victories of late and the momentum that still seems to be building suggest he could go all the way to the White House.
What sort of President might he be, apart from an appallingly entertaining one at times? He also has the redeeming quality of not taking himself too seriously, unlike the man he defeated in Indiana. It was good to see the back of Cruz. If the next President is to be a Republican, as normally it would be, I'd prefer the ugly American to the sanctimonious one.
Trump's indifference to the conventions of politics and complete lack of experience in government at any level are not totally ominous. He would come to the White House with a fresh mind, if he is inclined to use it, and options unencumbered by obligations to a party's legacy, a personal legislative record or donors to a presidential campaign.
Even in his wilder policy proposals, such as the ban on Muslim immigration, he would add "until we figure out what is going on". He seems genuinely to want to find out.
He may really intend to renegotiate trade deals but it is advantageous fixed exchange rates that really seem to bother him. If he can make floating currencies a condition of free trade agreements more power to his arm.
But the comforting truth is that the presidency is not as powerful as all who love politics like to imagine. It may be the world's most powerful office, there may be a nuclear button, but the US Government is a lumbering, three-legged beast and one leg can do little without the others.
Maybe the boys in baseball caps turning out for Donald Trump are well aware of how little damage he can really do. Maybe they can safely make him President just for a lark. It could be entertaining but when it comes to the point, I'd rather not find out.
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