> That stuff happens in large part because Republicans get elected after
talking about doing the things that you mention
Which in turn works because, even if they don't solve those problems, the problems are real and people experience them. So if you would make the problems actually go away, they would lose the ability to run on them.
> But they also get elected in large part because of the highly unequal and unrepresentative system that they perpetuate
This is what I mean by 46% vs. 51%. There are way bigger problems than the electoral college or district lines, which would only change how and where both parties campaign rather than making anything obviously better.
> including a media system built on feeding people falsehoods utterly disconnected reality (which is another reason ~half of voters voted for them).
This was never great but the thing that really seemed to turn it into a tornado full of broken glass is the interaction between Trump and the traditional media.
Major media outlets were used to politicians fearing them, and then Trump didn't, so the media got more aggressive and less cautious. Which was only effective for a minute until people started to realize what they were doing and that set the media's credibility on fire and made things dramatically worse.
Meanwhile the right-leaning media outlets, which were traditionally more partisan but only a little, saw this and their conclusion was basically "oh, so we can just do whatever now?"
> There are a lot of problems with the Democratic party as well, which is precisely why radical change is needed rather than just "pass some garden variety Democrat measures".
The most significant thing you could actually do is replace first past the post with one of the cardinal voting systems (STAR, score, approval), because it would allow for more than two parties. Which in turn would upend the the entire partisan apparatus of both sides which has evolved in that environment and would be maladapted to defending itself and therefore vulnerable to positive change. But it's also a subtle enough change and distinct from any of the usual battle lines that all of the villains you'd be disrupting might not recognize the implications until it has already gone through.