There is a real problem with NIMBY Dems, or “light blue” Dems or whatever label you want to apply, as has been discussed, but I want to make two points about this:
1)The NIMBY Dems are rarely solely responsible for the bad election outcomes on these issues: it’s almost always NIMBY Dems joining with the GOP voters to vote against good policies and for bad policies
For example, CA is about 60% Dem, and 35% GOP in recent elections, with a few percent of third party / other. But if you look at the votes where the liberal position got beaten, like with the Uber Initiative, it’s often like 40% to 45% voting for the liberal position and 55% to 60% for the other position, and the composition of those voters tends to be ALL of the GOP voters vote in what I consider the worse way, and then maybe a quarter to a third of the Dem voters join the GOP voters to create a majority for bad policy. So the NIMBY Dems can’t screw things up by themselves; they are a problem b/c they add to the already existent problem of GOP voters voting for bad policies.
So NIMBY Dems are a problem but the GOP is also a problem.
2)Messaging - even when the Dems do stick to their principles, the GOP will attack, often using mis-information and mal-information, manipulating and distorting fairly straightforward policies into horri-bad extreme scenarios (“denser zoning means BAD PEOPLE WILL LIVE NEXT TO YOU AND RAPE YOUR FAMILY!!!” etc.) Oft times, self interested NIMBY Dems will also feed into this messaging BS and so are a part of the problem. But as in #1 above, the GOP is ALSO part of the problem in almost every one of these cases.
The TLDR version of this post is: yes, NIMBY Dems are a problem, but they are a problem b/c when added to the existing problem of GOP voters, they pass bad laws. The GOP voters are a huge part of the problem, also.
Edit: Note, this underlines the reality of America as a patchwork of red, blue and purple rather than big swathes of just one thing or another. Even in CA, there are strong red areas, and even in blue areas within CA, there are red neighborhoods, etc. It’s all a patchwork.