Their job is to sit in meetings and have people speak at them, before they do whatever they want with zero mechanic for accountability. Like, if you're even the least bit sentient, why the fuck would you not stick around in that job for as long as humanly (or inhumanly) possible? It's not like the Democratic Party is trying to actually effect change, so why shouldn't the party just be a mechanism for self-righteous fossils to feel important.