I agree with some of what you say in terms of the Dems being a bigger tent etc. but if they were more cohesive Hillary would now be part way through her second term.I don't quite agree.
That the party is "center left but very moderate" is an ok description, but I think it is more a case of just how wide a coalition the Democrats are. There are just more factions with differing priorities than there are in the GOP. (The GOP has factions, but they agree on goals more, even if they disagree on priorities. There are fewer major split points, although the current "culture war ascendant" aspect may end up pushing them into a more confrontational position.)
As far as the left self-sabotaging the team if they don't get their way, I don't really think that's true. The Progressive Caucus has been much more cohesive and on board of late. It's been the so-called "moderates" who have been willing to fuck up the team for their own gain and help the GOP. If we are talking online fan club and voters, though, then you do have a very loud "leftist" contingent that is very committed to fucking things up - but they don't really vote Democratic anyway.
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