The Democratic Party is a coalition. So instead of faction, is it ok to call berners a group within the Democratic Party?. You guys aren't the whole deal. You don't disagree with that, do you? I mean, in 2016, the Berner group weren't a majority in the party. Not even close. Not unless you want to say that 45% >> 50%.
Regarding "significant fraction of democrats voted for trump". Where did you get that truthy statement? The numbers crossing over were small in any direction and trying to read something out of it is a fools game. The largest number was 11% white Democrats voted for Trump or third party. White voters crossing the line in the Republican party? 9% of white Republicans voted for Clinton or a third party. What you said sounded so certain. But it was just a crappy sounds like truth but is not.