Fighting for a good cause matters.
There's not a direct cause and effect consequence between those two events.
That's not a rebuttal to what I said.
Well I addressed the "Bernie is the only person pushing liberal liberal legislation" line. ACA was subject to a long-term sustained negative marketing campaign which made it toxic. It was a major item which allowed the GOP to make so many gains in 2010 - an item so much on the forefront that it was attempted to be repealed over 60 times and was a constant item in campaign attack ads against Democrats. President Obama, as it was being debated, admitted that there would likely be many political causalities for passing this. And there was. Obamacare wasn't exactly supposed to be and isn't an endearing name for the legislation.
So I do think that is a major reason that once it passed, you didn't hear lot from Democrats on further improvements - hell, it wasn't even fully rolled out at that point. My point was Dems pulled off a monumental feat even getting it passed. And just now in this particular window, can there be a larger push for more liberal policies. It's great Bernie introduced something - even if he historically was not a Democrat. I just don't see the point in calling out Democrats because he was the first this time.
The other reality is that this country is largely center to center right. Liberal policies overall seem to do poorly across the country. So of course, Democrats understanding their base, may not champion liberal policies because the fact is they'd stand a good chance of getting destroyed over it.
The Democratic party isn't a pure progressive party. It can't be if it wants to remain viable in the US.