I think Dean will go next. He hasn't won yet, and I don't think he will win anything in the next cycle. My guess is that either Edwards or Clark will drop out soon as well, unless they can both eat into Kerry's support. But they can't afford to keep splitting the non-Kerry vote.
Are you serious? Surely you've heard Edwards' story by now - he's about as far from aristocrat is they come. He's rich, sure, but he made his money the honest (and American, in my opinion) way: he worked hard and saved.