From the first article, we can see what the fuss is about:
Democrats John Edwards and Hillary Rodham Clinton consider themselves among the top presidential candidates.
They were caught by Fox News microphones discussing their desire to limit future joint appearances to exclude some lower rivals after a forum in Detroit Thursday.
On one hand, Hillary has a point. There are a lot candidates and not much time to get to the meat and potatoes of the issues, when so many people get to answer questions (assuming that they actually answer them and not stonewall). We can also understand that realistically, there are some that have no real chance of being nominated.
But on the other, the debates do not belong to the front-runners. They belong to the people that want to learn more about the candidates. Not only that, how else can the lower tier candidates have a say in how the party platform is shaped?
It's double edged sword, no matter how you look at it.