Can you name one? And to the extent you can, I would argue that liberal policies will kill the party sooner or later. Yes, there are other forces at work, but liberal policies only serve to exacerbate not alleviate. A liberal looks at the deterioration and does not ask how to restore economic growth. Instead, the liberal seeks someone to blame and demagogue, aka “the rich” and ends up driving anyone who could bring growth right out the door.
Boston and San Francisco are hardly dead or dying cities. If liberal policies alone could kill these cities then they would have been dead long ago.
Neither of the these cities have ever been dominated by one industry which could be a reason.
Chicago and New York are far from dying.
I can’t speak for other cities but Boston liberals are usually smart enough not to place liberal burdens on the local industry. As they say politicians can be bought for a price.