Well, thank you for proving my point.
I didn't say mainstream, specifically. And in fact I made it pretty obvious that I don't think all Democrats are SJW lunatics. So, let's stick with what I did say.
The ideological engine of the party (not the voters) is being driven by exactly these types of lunatics. That you are unaware of them is irrelevant. They are *everywhere* in academia, politics, media, and especially big tech companies. While you go on with your life, blissfully unaware, they are whispering in the ears off those making the decisions. Critical race theory, anti-racism, equity... There are a ton of pseudo-intellectual theories that are gaining traction. You shrug them off because you're a rational human, but this curriculum is being taught in classrooms and boardrooms across the nation, and many people are buying the dogma. Again, regardless of your ignorance to the philosophy.
White Fragility has been a Best Seller for over a year. That's not fringe. Read it and tell me it's not the most insane shit you've ever read. Yet, it's definitely relevant on the institutional left.
So, exactly like I said in my post, liberal voters don't know what their own party is espousing. There's no conservative equivalent right now. If Richard Spencer was making huge book deals and having his lectures quoted by sitting senators and presidential candidates, I'd agree with you. But that's not what's happening.