If there's one thing we know for certain, the Democratic party establishment only knows how to punch left and punch down.
This is what they learned from their ass kicking in 2010.

And this is what they learned from their ass kicking in 2016.

And this is what they learned from their ass kicking this week.

"No one should say 'defund the police' ever again," Spanberger yelled on the leaked call. "Nobody should be talking about socialism."

Spanberger, who won re-election by a narrow margin of 0.2 percentage points, called the election results "a failure" and told other Democrats, "We lost races we shouldn't have lost."

She added that if progressives continue to use this rhetoric, "We will get f-----g torn apart in 2022."

Rep. Stephanie Murphy was even more direct and to the point.

“I think that the Democratic party needs to clearly push that we are not supportive of ideas like socialism or defunding the police or anti-Semitism,” said Rep. Stephanie Murphy, D-Fla., a co-chair of the House’s centrist Blue Dog Coalition.
...“This playing footsies with socialism is not going to win over most of America,” she said. “There’s no amount of lipstick that can cover up the fact that these far left ideas are costing us races.”

It's all the fault of the left! That's all you need to know.
Of course if you think about this for just one second the logic breaks down.

For starters, only conservative Democrats lost. No incumbent progressive Democrat lost. So something's wrong with this logic.

Fox News exit poll: 72% want a government-run healthcare plan aka Medicare for All

FL voted for a $15 minimum wage

SD, MT, AZ & NJ voted to legalize marijuana

CO voted for 12 weeks of paid family & medical leave

Get back to basics by unifying behind an FDR agenda for the 99% https://t.co/tx3CO5CLf6

— Warren Gunnels (@GunnelsWarren) November 5, 2020

And then, there's the much more important implication of what they're saying.

So are we supposed to believe that if Rep. Pramila Jayapal, who represents Seattle, never let the word “socialism” pass her lips again, then that would mean that some centrist Democrat from a district 3,000 miles away would have an easy path to victory in every future election?

And what exactly are centrists asking progressives to do? It sounds like they’re saying, “Republicans falsely accused me of believing what you believe, so that means you have to change your positions and believe only what I believe.” Do they want the progressives to change their beliefs on health care or economics or some other issue? Should the progressives just stop advocating for their preferred agenda at all?

That is what they are saying: the Democrats can't win as long as any progressives exist in the party. They are advocating for a purge of the left. They are advocating for a second Republican Party.
Not exactly a big tent party is it? Race and gender? Big tent.
Political ideology? Very small tent.
Florida voted overwhelmingly to raise the minimum wage. Even Red counties supported it.
The Florida Democratic Party rejected raising the minimum wage as too far left. Several of Florida's conservative candidates lost.

And then AOC actually looked at the data and found something interesting.

Ideology + messaging are the spicy convos a lot of people jump to but sometimes it’s about execution and technical capacity.

Digital execution was not good, polls were off, ironically DCCC banned the firms who are the best in the country at Facebook bc they work w progressives!

— Alexandria Ocasio-Cortez (@AOC) November 6, 2020

The Democratic Party establishments war on progressives actually bit them in the ass? That's hilarious!
At least it would be hilarious if reality had any impact on the Dems.
Biden hasn't even officially won and already excuses are being made why why no progressive policies can even be considered.

They campaigned enthusiastically for the more moderate Biden in the general election hoping he’d move to the left once elected. But there’s now no reason for Biden to move left, because he’d be pushing programs that alienate some of the centrists who voted for him yet have no chance of becoming law.

Why oh why does a political party that offers voters nothing, and that publicly and enthusiastically rejects its own base, have difficulty winning elections?
It's truly a mystery.
But one thing's for certain: it's the fault of the left.