Politics, which really is about the art of expression, ought to be a logical profession for writers (it's very hard to explain to politics- and policy-addicted people that language is the basis of all ideas - if you can't say it, you can't think it), instead of a refuge for lawyers and apparatchiks.
Long-running scandal fuels targeted political media. It's the stuff of obsession, which is the basis of a passionate core audience. More obsession means more passion and a crazy, over-the-top audience. Equally, of course, this obsession leads to less soberness, moderation and disinterest in the media world.
Brexit and Trump are a generational revenge. This may partly be against millennial certainty and superiority, and, indeed, ageism; and it may be a natural part of population dynamics - not only are more people getting far older than ever before, but they are older for longer than they are young.
Donald Trump has been both a peculiar and characteristic American figure for more than three decades. Inheriting a small New York real-estate development company from his father, he parlayed it not so much into a big real-estate company, but himself into a fantasy of a big real-estate developer.
Running for office, or suggesting you might, is no longer about being a politician but being an independent opinion or sensibility entrepreneur. You're looking for an audience to identify with you. Rather than trying to convince a majority of the electorate, you're looking to cull your particular following.
Bill de Blasio, for his part, became the mayor of New York, surely the most powerful local political position in the nation, and arguably - after Giuliani and Bloomberg - one with a national base, one with, practically speaking, no job at all. He went from marginal political flotsam and jetsam to extraordinary centrality within a few months time.