Let us focus on one of the things wrong with the Democratic Party. There are plenty to choose from but let's just focus on one: They seem to care too much about effective governance and not enough about forming a united front to win elections. Kevin Drum has two back-to-back posts on his blog that make this point well. Read this one and then read this one.
Donald Trump promised voters that if he got elected, there would be healthcare for all and it would be better and cheaper for everyone. His "plan" turns out to be to get rid of Obamacare — perhaps just because it's Obamacare — and to replace it with nothing and not give a damn who gets hurt. This has not harmed him a lot (if at all) with the folks who put him in office. Some of them will lose their coverage completely or see their rates skyrocket and they will somehow not blame Trump or the Republicans. In the meantime, there are Democrats willing to tear the party apart fighting over this plan versus that plan.