What are some past incidents in which Dems tried to set up an opponent or cheat?

Hillary rigging the 2016 primaries is the first one that comes to mind.

Read up on what Obama did to keep Sarah Palin from winning the Republican presidential nomination. Take a look into Hillary vs. Obama back in 2007-2008, when both were competing for the presidential nomination. Also look into what the Dems did to get Bernie Sanders out of the 2016 race (they bribed him with his own private jet). They pretty much don't actually care about following the rules for campaigning for an elected office, they CHOOSE who gets to win from the get go and then change the results behind the scenes to suit the chosen candidate, and all the while they fake making it look like their people were genuinely competing for votes. I also suspect they were behind the Uniparty choosing a loser like Mitt Romney to "compete" against Obama in 2012, when the election's results had been decided a year in advance, but they made it look like Romney was going to be the Right's champion, when in fact he was just playing a part and an easy opponent for Obama to "defeat" in the race.

In fairness to the Clinton/Sanders situation, which seems to be what most people remember, Bernie Sanders is not a Democrat but a left-wing Independent. He was certainly given a platform, but lost possibly due to the superdelegates breaking for Hillary. But he was behind anyhow! These unelected delegates are anti-democratic in nature, so I'd like to see their voting power removed in future primaries. I'd also like an repeal of Citizen's United which benefits the GOP demogogues far more.

It's hard for me to disagree with Sanders being somewhat of a pariah by the DNC. He didn't run in Vermont as a Democrat. The idea that a candidate is going to platform on "democratic socialism" in this country was not a winning strategy and is not even accurate. It's the goal of the DNC to constuct a winning platform. My take was that he was only seeking to remove the ammunition of the right-wing who were claiming Social Security, Medicare and Medicaid as, like, something from the Bolsheviks. I'll entertain an argument for anyone who disagrees and thinks he actually wanted the federal government to seize the means of production, distribution and exchange while limiting private ownership, but I think that's a pretty far leap.

Hillary Clinton would have made an outstanding president, and appeals to me far more as a centrist. She would have definitely reacted early to COVID-19 and prevented hundreds of thousands of deaths while it remained isolated to the Pacific Northwest. The American People would still have a certain moral integrity that sort of disintegrated under Trump's leadership. How are we supposed to react as a population when the elected Chief Executive tells us to drink disinfectant? Everyone is so mean now. People are influenced by leaders, lets be real about it all. Tact and diplomacy matter. There is no reason for the right-wing to avoid embracing a conservative stalwart, who can convey optimitism and hope for America as a shining city-on-a-hill, as Ronald Reagan did.

Politics is a dirty business, and perhaps Hillary Clinton or others were shady about things as they were trying to pave their road to victory. There's no shame in accepting that and even expecting that. But Trump was a different animal. Corrupt. Evil. It was never about governence for him, but rather promoting his brand and personality on a world stage.

you republicans are no better