I thought the government shut down was because Democrats stood for affordable healthcare for ten of millions of ordinary American citizens.

That's an effort by the leadership to correct the impression that the Democrats don't stand for anything. By reminding folks of one of the major things that the Democrats stand for - government-subsidized health care.

But the progressive base is dissatisfied with that, believing that the Democrats don't support enough policies full-throated enough to "meet the moment," as the kids say. The centrist faction is dissatisfied because they're frustrated by "everything bagel" approaches to policies - the old saying that if everything is a priority, nothing is.

It's hard to answer the question, "What are the three policy things the Democratic Party cares most about?" with the ease that you could do so for Trump. With Trump, it's: i) immigration hardline; ii) tariffs and reworking international trade; and iii) low low taxes. But with the Democrats, what are they? Is it still health care? Climate change? Voting rights? Reducing inequality? Child care, trans rights, free college for all, increased labor protections, reducing housing costs.... what's the top three?