I don’t know how things will be post-Trump, but up until now I’d say that (especially at the local level) it was very possible to field more left-leaning candidates and move the Overton Window to the left. We know this because the far right has very successfully shifted the discourse rightward, and a door can be traveled through in either direction.

Now, though, I’m not sure if Trump & co will even bother with sham elections. I suppose time will tell.