Why isn't Sanders winning?

The unsatisfying explanation is probably the right one.

Things are looking grim for the Sanders campaign. And this, of course, has sparked a new genre of take that tackles the obvious question: why isn’t he winning?

Unfortunately, I don’t think that liberal-left discourse will provide us with much help as we search for a way to win. For one thing, we are (understandably) impatient for victory, and that will i…