What is Daily Kos

I was explaining Daily Kos to someone not from here, and I think I stumbled upon the right explanation. It's not radically different from what's been said, but I don't think I've seen IMO the right analogy before.

Imagine a corporation where the board of directors and top management have not been serving the shareholders' interests. That's the Democratic Party and many big, issue-oriented advocacy groups on the left. Daily Kos is about organizing the shareholders.

Maybe Markos already used the analogy in Crashing the Gate and I'm having memory problems, but as far as I do remember, I haven't seen it put that way.

So what's your definition of Daily Kos?