When will we know the event that splits the democratic party? (legal, drugs)

[johnsonkk]

For those watching the one side of democrat politics with the vulgar woman march and public support for the BLM, there are millions of disenfranchised democrats that want the party to separate from the Hollywood elite crowd.

What event will finally split the extreme democrat outcasts and the middle American democrat that still wants higher taxes and more immigrants and legalized drugs? Will it be the 2018 election? A riot? Public outcry?