Re: POTUS 45.0: It was the best of times. It was the worst of times.
The process isn't rigged. Everybody knows the rules going into the election. It's a matter of process execution by the parties.
There is rigging, but it's not really the rigging that people think of when they say "well, Clinton won the popular vote cleanly and the Dems won the greater total of votes for both Chambers, and yet the GOP has a sweep of all three. Something is wrong."
Nothing in that is
necessarily wrong. The pop vote / electoral vote is in the Constitution and is not "rigging." I'd be in favor of scrapping the EC, but that's not the point. Likewise, the Senate difference between total votes cast and the Senate composition is explained by Constitutional provision that less populous rural Republican states get the same Senate representation as highly populated urbanized Democratic states. Again, I would choose to amend this, but it is the current rule set.
The House is in fact "rigged," but far more indirectly, and it is ironically rigged by democratic means. Both parties gerrymander but Republicans have been able to gerrymander more effectively since the 2010 census. This is because state legislatures control the drawing of districts and Republicans did well in the 2010 election which chose the state legislators who drew the districts. 2010 happened to be a midterm election in which Republicans, with a smaller number of more fiercely committed voters, do disproportionately well in. So while Republicans "stole" the House, they stole it fair and square. Dems had the same opportunity and incentives to get to the polls and win majorities in state legislatures. We just didn't.
Voter suppression is real and it looms as a "nuclear option" threat for Republicans to win elections by disenfranchising voters. I do not know whether there is any documented case yet of the GOP stealing a Senate or Presidential election by voter suppression. The House I'm sure they have managed. It's a terrifying threat that ought to concern everybody, not just Democrats who happen to be on the short end of the stick right now. If for example the education gap between voters continues to widen, in future voter suppression measures will help better-informed Democrats disproportionately.
It would be A Good Thing to make it illegal now for the benefit of the whole body politic, but of course that only happens if voters push with bipartisan force, and the corporate control of media ensures that less powerful people are always at each other's throats over invented poutrages.