Wasserman Schultz on behalf of the Clinton campaign (de facto, not officially) smeared Sanders supporters as violent rabble and Sanders as promoting violence, in line with the Clinton's campaign basically conservative attacks on Sanders throughout the primary campaign.
Part of the cost of conservative Democrats like Hillary Clinton promoting this kind of sleaze is that they validate and empower the same kind of tactic being used against the Democratic Party as a whole, including conservative Clinton Democrats. This report from The Young Turks gives an example, No, This Woman Wasn’t Beaten By Bernie Bros 06/08/2016:
In this additional report from The Young Turks, Ana Kasparian at just after 1:20 talks about the impression the anti-Sanders anathema had on her thinking about Hillary Clinton, Will The SCOTUS Pick Convince Progressive [sic] To Vote For Hillary? 06/07/2016:
She says there:
I can't get over it, I can't stop thinking about it. And every time I even consider rallying any type of support behind Hillary, I think of that. And it was so dirty, and it was such a low blow, considering the fact that Bernie Sanders has been very highbrow in his campaign. He's only attacked her on the issues, he did not exploit the e-mail scandal at all to attack her. ...
It was a lie, and it [the lie] happened. And that lie keeps getting repeated in the media today, right?