"Ignored" is putting it charitably. Ignoring is when you don't listen, and just go on with what you're doing. When you react to Sanders as a threat and torpedo him with dirty politics, that's something else.

The anti-Semitism included in that initiative, plus the xenophobia of blaming the Russians for exposing the truth (which I don't think they had anything to do with), sounds a lot like a certain other major political party we're familiar with. No wonder these people don't like Bernie... they're not Democrats and he is.