I think you could make a case for the Democratic Party coming apart. This new, younger, quasi-Socialist faction really doesn’t sit well with the old guard of the party. Will be interesting who gets the ultimate nomination, given this obvious division. I think that selection process will make the division that much wider.
Hard to imagine the Dems beating Trump when their party is so divided. If they nominate a conservative, the radicals will bolt; and if they nominate a radical, the old guard will.