What do you mean by jettisoned?
The fringe on the left already is pretty marginalized. We nominated a very centrist candidate, against the wailing and screaming of the far left. We have a pretty central and moderate platform.
If a few of 435 representatives from very deep blue areas have some fringy ideas, so what? They are not taken seriously by anyone but right wing media, who turns around to try to convince you that those are the ones leading the party, when all actual evidence points to the contrary.
OTOH, the fringe of the right has been leading the way. Beginning with the teaparty and culminating in Trump.
It’s not a matter of the roles to sink in, it’s a matter of getting people to stop choosing to consume news sources that reaffirm their delusional beliefs rather than inform them as to reality.
I mean, when someone chooses a news source who has used the legal argument that no reasonable person would believe their reporting as a defense against libel, they are choosing to be lied to. I don’t know how you fix that.