@Revan too
I could give a spiel about symbolism and how when push comes to shove, the House Dems will go with their donors. I could talk about the empty-headed naivete of believing what obviously-bad actors want you to believe.
But instead of talking in abstract here are examples of the Dem party being a rational actor guided by its funding sources, putting forward things when they cannot pass and retreating from them the moment it looks likely.
1. In 2006 there was a massive anti-Bush Democrat wave. They gained control of the House with "far-left San Fransisco values" Pelosi as speaker. On the 1st of March 2007, just 2 months after getting power, the House
passed card check, allowing much easier unionisation, fulfilling a 30-year union demand. The bill passed the House easily (same link as before) but failed in the senate.
In 2008, they increased their House majority, got 60 in the senate, and most importantly, had a progressive Democratic president. The bill was re-introduced in the House -
and stayed there. Never even made it to the senate, even though there were more Democrats in the House now, and even though the president
included card check as a campaign promise. Biden signaled in Jan 2009 (same link) that card check would be done later. It was never even introduced to the House after that.
Today, there is no card check and union density continues to decline.
2. The previous governor of New Jersey was Republican Chris Christie. He dealt with a Democratic legislature. The legislature passed a tax on millionaires 5 separate times while he was governor. Christie was beaten in 2018 by Phil Murphy who campaigned on the same tax.
5 months after his election, the NJ state senate president (D) said: "This state is taxed out. If you know anything about New Jersey, they’re just weary of the taxes." (The same taxes they had camapigned on and won a landslide.) The governor never referred to it.
Today, there is no millionaire tax in NJ, and school fnding will be cut to make up the budget shortfall this year.
Source.
3. In October 2009, Democratic Sen. Rockerfeller
said: "I will not relent on [the public option]. That's the only way to go."
In February 2010, it was realised that Obamacare was going to be passed by reconciliation, which meant the 60-vote filibuster barrier no longer existed. Everything, including the public option - which his president had campaigned on - was on the table. There was a comfortable House majority, and a bill with the public option had passed the House multiple times since 2007.
However, the final proposal from Obama did not include a public option. People who value others' lives wondered if it might be added to the bill, and turned to Senator Rockerfeller for his "unrelenting" support.
His reply, 5 months after the previous statement, "I don't think the timing of it is very good, I'm probably not going to vote for that." During reconciliation, the public option was removed from the House bill by the Democratic senate.
This article by the centrist golden boy Ezra Klein reports that many senators publicly supporting the public option privately opposed it, and the WH was "sharply resistant" to it. Ezra calls it "strange politics", but that's because he doesn't understand how politics works.
Today, there is no public option, people die because of lack of insurance, and Obama's VP is campaigning on it 12 years later after he campaigned on it and won.
4. All these are examples of Democrats making mild populist appeals during the campaign, when out of power, or when there was no chance of it passing, and retreating the moment they get in power or find broader support. Now here is a case where they retreated even before they got in power, just because the idea became politically plausible because of the upcoming preidential election.
Medicare For All grew from 25 sponsors in 2003 to 120 in 2017. The big blue wave of 2018 put in about 40 new Democrats in the House!
And the number of M4A consponsors *
fell* to 116, which means as a proportion it went from 62% of the party to under 50%. All of the senate bill cosponsors famously ran away from the bill the moment they became presidential contenders, not even waiting to win for the inevitable betrayal.
Today, both presidential candidates have vowed to oppose any M4A bill that comes to their desk.