I think that it's all about victimization. "If you fail, it's not your fault. The deck was stacked against you." Leftists promise that they can "even the playing field," while what they're really promising is a minimum level of success. And that's generally what they deliver: Minimum levels.
Plus, they always need more "true believers," especially in a "democratic-socialist" state. That way, once they have the majority of the votes, they can begin voting themselves the rights and property of the minority, i.e. the productive classes.
Mark