If you want to make a difference in this country, you need to be prepared for a very long, very frustrating slog. You have to buy off interest groups, compromise your ideals, and settle for half loaves — all the things that Bernie disdains as part of the corrupt mainstream establishment. In place of this he promises his followers we can get everything we want via a revolution that’s never going to happen. And when that revolution inevitably fails, where do all his impressionable young followers go? Do they join up with the corrupt establishment and commit themselves to the slow boring of hard wood? Or do they give up?

I don’t know, but my fear is that some of them will do the latter. And that’s a damn shame. They’ve been conned by a guy who should know better, the same way dieters get conned by late-night miracle diets. When it doesn’t work, they throw in the towel.

Most likely Bernie will have no lasting effect, and his followers will scatter in the usual way, with some doubling down on practical politics and others leaving for different callings. But there’s a decent chance that Bernie’s failure will result in a net increase of cynicism about politics, and that’s the last thing we need. I hate the idea that we might lose even a few talented future leaders because they fell for Bernie’s spiel and then got discouraged when it didn’t pan out.

I’ll grant that my pitch — and Hillary’s and Barack Obama’s — isn’t very inspiring. Work your fingers to the bone for 30 years and you might get one or two significant pieces of legislation passed. Obviously you need inspiration too. But if you don’t want your followers to give up in disgust, your inspiration needs to be in the service of goals that are at least attainable. By offering a chimera instead, Bernie has done the progressive movement no favors.