Your objectivity in the Sanders endorsement has been well respected - from my front.
That's my issue with Sanders. Some of his supporters have more integrity than he does
Sanders' eventual endorsement has been long expected; what's strange has been the response from party elites and the establishment/Clinton die-hards in the media. For months, Sanders supporters were derided as naïfs subscribing to a wide-eyed, adolescent hero-worship with no long-term ideological backbone. Now that Sanders has fallen into party rank, those former Sanders supporters who haven't immediately followed suit—who have suggested, even, that they might pursue other voting or party options—are being mocked as petulant "sore losers" who subscribe to a wide-eyed, adolescent insistence on "ideological purity," and who can't accept the way the world works.
Which is it? Or is it maybe that the party establishment doesn't like having to brook any dissent within what it considers
its ranks? Perhaps there is also a little reactionary discomfort at not holding the moral high-ground on their "side" of the debate? (Because there are only supposed to be two ultimate sides, right?)
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As for Sanders' "integrity", I don't know. Platform was a much bigger issue than personality, for me.
I think, at the end of the day—whether it's driven by ideals, practicality, concern with legacy, or all of the above—Sanders hopes to do exactly what the author of the NYT article 50 posted advocates: I think he'd like to inspire reform in the Democratic Party from within, and push it back left, even if he isn't the eventual elected beneficiary. To do that, one has to play ball with the party; to play ball with the party, one has to fall in line.
I think where a lot of his former supporters diverge is to what extent party reform is even possible. And, indeed, I think the party establishment have given them a lot of good, practical reasons to suspect that it
isn't very viable, especially in light of the pretty bellicose response to the left-leaning "insurgency" this primary season (and I'm not talking structural conspiracies here; just the rank-and-file left-demeaning rhetoric of both official and effective surrogates).