Seth Ackerman:

But most importantly, if anything is liable to "split and disable the Democratic party," it's spreading breathless rumors that certain Democratic primary candidates, along with their supporters, are currently serving as unwitting agents of Putin, but I won't tell you which ones, except they're definitely the ones "demonizing" other Democrats as "establishment." You know, those candidates. Be on the lookout for them.

And of course this comes at a time when the DLC/Third Way/"Opportunity Democrats" are preparing an attack on the Bernie wing. BoomerCorps and apprenticeship programs (see here) aren't going to win that fight, but maybe some modern day McCarthyism will.