For months I’d thought and written that Sanders campaign manager Jeff Weaver was the key driver of toxicity in the the Democratic primary race. Weaver has been highly visible on television, far more than campaign managers tend to be. He’s also been the one constantly upping the tension, pressing the acrimony and unrealism of the campaign as Sanders actual chances of winning dwindled.

But now I realize I had that wrong.

Actually, I didn’t realize it. People who know told me.

Over the last several weeks I’ve had a series of conversations with multiple highly knowledgable, highly placed people. Perhaps it’s coming from Weaver too. The two guys have been together for decades. But the ‘burn it down’ attitude, the upping the ante, everything we saw in that statement released today by the campaign seems to be coming from Sanders himself. Right from the top.

This should have been obvious to me. The tone and tenor of a campaign always come from the top. It wasn’t obvious to me until now.

This might be because he’s temperamentally like that. There’s some evidence for that. It may also be that, like many other presidential contenders, once you get close it is simply impossible to let go. I don’t know which it is. That would only be my speculation. But this is coming from Bernie Sanders. It’s not Weaver. It’s not driven by people around him. It’s right from him. And what I understand from knowledgable sources is that in the last few weeks anyone who was trying to rein it in has basically stopped trying and just decided to let Bernie be Bernie.

Sanders speech tonight was right in line with his statement out this afternoon. He identified the Democratic party as an essentially corrupt, moribund institution which is now on notice that it must let ‘the people’ in. What about the coalitions Barack Obama built in 2008 and 2012, the biggest and most diverse presidential coalitions ever constructed?

Sanders narrative today has essentially been that he is political legitimacy. The Democratic party needs to realize that. This, as I said earlier, is the problem with lying to your supporters. Sanders is telling his supporters that he can still win, which he can’t. He’s suggesting that the win is being stolen by a corrupt establishment, an impression which will be validated when his phony prediction turns out not to be true. Lying like this sets you up for stuff like happened over the weekend in Nevada.

As I said, it all comes from the very top.