In essence, he argues that the Tea Party captured the outrage people feel about the failure of the system, their fear of economic disaster, and their desire for utopia.
The liberals, having wedded themselves to Professionalism, could not talk in terms of Populist outrage. This is ironic, of course, because the Republicans used to be the party of steely-eyed realism (i.e. Professionalism), and the Democrats used to be the utopians (i.e. Communist paradise).
Now it's all reversed. If you were a Republican fifty years ago because you thought Democrats were hopeless dreamers, you should be a Dem now. When the Left was supporting Communism, they were idiots. Now that the Right is supporting theocratic fascism, they're the idiots.
Pity the Billionare