Democrats that'll side with the party on every issue no matter how bad and defend the party no matter how corrupt.

Adj. Something that is expected to have a long lifespan by virtue of having existed for a long time, based on the lindy effect, named for the New York restaurant Lindy's, coined by Albert Goldman and popularized by Nassim Taleb.

A New York Democrat is an establishment democrat, who supports the Democratic Party no matter what they do. Some peole would refer to them as a "shill."