Someone who votes democrat because they rely on the pandering handouts given to them by the government. A big believer in the Nanny-State. Not quite a commie rat but with definite communist leanings. They never really accomplished anything in their life but somehow think the world owes them something.
The Authur Spooner character on "King of Queens" played brilliantly by Jerry Stiller is a good example of a dependocrat. He leeches off his daughter and son-in-law as well as the government and doesn't have a pot to piss in due to his own lack of planning or ambition.