And you can probably go further back than Ronaldus Magnus for the sheer assholery, to Robert Taft (son of William H.), or even Herbert Hoover, but Reagan seems to be where they decided what the hell, no one cares about policy or even reality, so fuck that. And...sadly, they're probably right about their base. To the base, politics is just another reality TV show and fuck the libs when you can't own them.
Oh, and let's give a nice, sarcastic round of applause to the major media (golf claps or slow claps), which for decades enabled lies and bullshit under a both-sides/we-just-report regime. Oh, and special thanks to the NY Times, which has done this for even longer (Google their original reporting on the rise of a right wing movement in Weimar-era Germany).
As for the Dems, sigh. I dunno, here's hoping Biden can work some magic, but consider: Nancy Pelosi (to her discredit) claims she quotes/cites Reagan in speeches...and do you think that's kept the wingnuts civil? Laff.
I think Dave Neiwert is right: we're stuck with this for a long time. Hell, we've been stuck with it for a long time, but it was just a few of us on the left who bothered to notice...