The reason Trump won wasn't because of Bernie's policies which have very high approval ratings with the working class (Trump Supporters) and the young (Universal Healthcare, College Free tuition, The Green New Deal), nore was it Bernie's supporters abstaining to vote for Hillary (Hillary supporters abstained in greater numbers from voting for Obama in 2008) Hillary was generally a despised figure, her approval was extremely low in many polls 

What killed it for Hillary was her lack of any policy that addresses the real systemic issues in America today all centering around income inequality and its repercussions, she was happy to pander to Large Donors and Wall Street CEOs to get support at the expense of the people that really needed her support

Your analysis of the situation mirror nicely the EST Dems reasoning that lost them a shock election to Trump with his populous politics targeted working class America, the same working class America that the Dems are supposed to care about and fight for. The EST Dems have lost their way and people like yourself support their views, your all walking toward another cliff in 2024, oblivious to the real reason Trump became president

The Dems must be honest with themselves and stop making excuses, America needs champions right now to lift the lower income workers and struggling or they will continue to be shocked as they continue to pander to the powerful by attacking anyone even in their own party that wants to change the status quo (Universal Healthcare, College Free tuition, The Green New Deal) 

The Republicans have been losing the policy war for years, but winning the messaging argument. Republicans are real good at messaging and this isn't something that can be addressed by simply embracing popular policies. For decades, Republicans have been stoking the flames of a culture war with wedge issues. That is why so many Democrats are so milquetoast. The right's reactionary politics works well at making people afraid of change by highlighting small bits that make people afraid. Take Medicare for All for example. You are right to say that it is popular among voters, so what do Republicans do? They talk about how Bernie advocates to ban private healthcare, which is largely necessary for M4A. The vast majority of voters don't support abolishing private health insurance, both Dem and otherwise. 

So Democrats seek to find a policy position that will step on the fewest toes, which is largely what we saw from Biden. He does what he can to appeal to the M4A crowd, without wandering into issues that the Republicans can use as a wedge. 

As such, I think this mindset of "just go left, stupid" is completely missing the point. There is a reason why AOC works so damn well for Republicans. As soon as you stop worrying about the toes that you are stepping on, you are giving the Republicans ammo in the messaging game. As such, at a federal level, politics is a war of messaging and that is the highest hurdle to climb, and it cannot be done with policy alone...

So apparently they are going to the US Supreme Court to try to throw out Pennsylvania's outcome. 

https://lawandcrime.com/2020-election/alito-demands-briefs-in-pennsylvania-congressmans-lawsuit-to-flip-the-election/

Is this still nothing to worry about? Seeing an attempt to overthrow a democratic election result in a world superpower is quite disturbing, and doesn't the current SCOTUS lean right wing by 6:3?

Actually this is a very interesting case and one that I want to see if the SC will even look at it.  First, because the GOP are trying to throw out mail in ballots after a  policy reform a year later when the GOP did not even blink on trying to contest it until now.  Not only were the Presidential elections were run with that policy reform but also the primaries with no contest by the GOP.  Its the whole reason the SC in PA threw it out because its pretty much bogus.  Trying to come in after you lost when you had plenty of time to appeal a year ago or even during the primaries just shows its pretty much a dumb case. Just because the justice are right leaning doesn't mean they do not respect their job.  Its hard enough to get the SC to even hear a case and first and foremost they would need something very substantial to interfere with the elections.  So I would still say its nothing to worry about because its all a political game.  This is as much as an image seeking farce then anything with any meat but it should be interesting to see how this goes.

The Est Dems are so worried about what the Reps will say that they have repeated the same Rep talking points about the Progressives, arguably the most enthusiastic and youngest/future faction in the Dems

For example the Est Media and Est Dems constantly asked the Progressive Dems "How much will Universal Healthcare cost?" (Rep talking point), they constantly used the same arguments of cost blow outs even when the Progressives explained that actually costs would go down for everyone (No more Premiums, No co-pays, cheaper medicine and hospital care, less Admin costs), but this was constantly ignored by the Est Media and Est Dems to downplay Sanders ideas to help get approval with the donor class for a Status Quo candidate like Biden

The Est Dems/Est Media also used the same Rep talking points on the "Socialism" of the Progressive Dems as if to try and tarnish their ideas as radical (The Progressives embraced the label)   

All the Est Dems/Media have done is weaken themselves as they stand for nothing unless it passes the Rep talking point test, they are the "Rep lite" party if not in name, but deeds  

Progressives have no time in pandering to the self-loathing and self-destructive Rep talking points, they want the Dems to stand for something on their own   

Yeah, no. If the American voter cared at all about policy they would've voted in droves for Hillary, completely disregarding her character or message. But they didn't and that shows there are more superficial factors deciding who they vote for. To me there are 2 factors:

1. She is generally very unlikable and never really tried to appear as being close to the working class or understanding their struggles. Basically she never positioned herself as someone you could get a drink with. She was the stereotypical stiff politician and people hate politicians. Not to mention she was seen as the villain who duped Bernie, the people's champion.

2. Too much confidence for Democrat voters. Nobody took Trump seriously and polls showed Hillary easily leading, which lead to widespread voter apathy among left leaning voters. 

This nicely contrasts with the latest election where the voting campaigns where much more insistent and constant and juxtaposed against a Trump who was absolutely hated now. Since he was already voted once there was a great fear he could do it again, so it drove more people to the polls. That is the one and only explanation for the increased voter turnout. It wasn't the policy of the progressives, it was their voting campaigns that helped secure the presidency.

This election there were 15 million more Democratic voters. Where do you think they came from? Certainly not defecting from the Trump camp. Those were people who just didn't bother going to the polls last time and the reason behind that certainly weren't that Hillary's policies weren't radical enough. Because if you are a progressive and don't vote for the established democrats you area a grade A moron and a terrible progressive at that.

Hillary had no policies that mattered to the working class and young, so yes it mattered, Trump was untested no one knew how bad he really is, but he championed the working class (which the Dems should have) and got them to vote for him

The 2020 election was really an anti-Trump election, people came out including many progressives to expel trump once and for all, the fear of what Trump will do in a second term was the motivator, NOT Biden, the progressives did come out in support of Biden to boost his numbers in the hope that they may get some of their agenda through him and Trump out, unfortunately Bidens cabinet pick isnt looking too good for real reform, more of the same that got the Dems in trouble in the first place

I really feel the Est Dems are blind to what's actually going on with the people, 2024 will be tough on the Dems if the progressive ideas are not acted on, it's the progressive ideas like Universal Healthcare, College Free tuition, The Green New Deal that have the next generation of voters excited and onboard

If the Dems stay the "Status Quo", "Old Persons", and "those in power" party they will see many more failures and losses to come

Trump was not the cause he was the symptom of a broken system that the Est Dems and Est Reps (two sides of the same bent coin) don't want to change   

If it worked against Bernie when Biden said it, I'm not sure why you think it wouldn't work against Bernie when Republicans say it. That is my point here. There is virtually no evidence that embracing Bernie's policies would improve the Left's chances in federal elections, because the question is so much more complicated than "Is this policy popular".

It didn't work when Biden said it, Biden had virtually no voter enthusiasm for him and his "policies" during the primaries, It was all Bernie at that point, bernie had by far the most money from donations, he had by far the most individual donors, he had the biggest rallys, he had the most endorsement amongst those that needed the Dems the most, his ideas were the most popular like Universal Health Care, he was on a roll

But the Establishment turn on him hard when it looked as though he would win, one candidate after another quit to back Biden, who at that point was looking very weak, but the Establishment Dems were rooting for him and they made it happen, one after another all the other candidate pulled out and turned on Sanders, Dashing the Hopes of his enthusiastic campaign to finally change the system to one that better suited the working class and young

Sanders to his great credit kept his word and campaigned very strongly for the eventual nominee Biden in the 2020 Election 

If the Dems had gotten behind the popular Sanders as the nominee and rejected every Rep talking point, Sanders would have won just as easily against Trump, particularly as much of the motivation to vote was simply to get rid of Trump

Arguably Sanders could also have won in 2016 if the Dems didn't try so hard to stop him to prop up the very unpopular Hillary, and instead embraced him as the future of the Dem parties new and young voters that will eventually replace the old conservative guard   

If Sanders would have been supported, he would have won, and America today would be looking at a string of massive reforms that would benefit so many generations to come, instead the Est Dems conspired to keep the tired old and damaged system alive for at least a while longer  

A little revisionist history there.  Biden looked bad in a grand total of 3 states Iowa, New Hampshire and Nevada and everyone wrote him off before any major state had voted.  He then won south Carolina by a huge margin and this was before anyone dropped out of the race.  It was only after South Carolina where every other establishment candidate did horrible did they start accepting Biden as the represented and started dropping out.

So yeah all the establishment candidate backed Biden after dropping out but what did you expect them to do? Of course they backed the candidate they agreed with.  Also if you look at the super Tuesday states Biden would beat Bernie+elizbeth in most states.  My point there is Biden did not win because the establishment vote came together and the liberal vote was split.  He won because more primary voters support his approach over Bernie.