I suppose an argument could be made that every little bit of effort that the DNC exerted helped, and in contests that close, dean's plan could have made the difference. personally, I think it was DCCC chairman rahm emmanuel.
I think of the 50 state plan as more of a sustaining plan.
Rahm Emanuel did a good job as well.
Dean has said (I read) that if a democrat gets in the White House he's stepping aside.
50 state plan strikes me as common sense if you are trying to win the house and senate, but suicide if you are trying to win the white house. there is no way the democrats are going to win some states; utah, mississippi, idaho just off the top of my head, and just for example, and every dollar they spend campaigning for president in those states is wasted. and I have heard the argument about obama bringing millions of new people into the party, and that he will put states into play that have never been competitive before. I don't buy it; at least not to the extent that I hear it being sold. the "new voters" that he is bringing into the party, if they show up at the polls in novemeber, will make it hard to win crucial swing states -- ohio comes to mind -- but I I don't think even he means it when he says that he is going to be competitive in every state in the country.
I think the party chairman of the party in control of the white house serves at the pleasure of the president; I'm not sure it formally works that way, but it works that way as a practical matter. so, if obama wins in november, he will put his guy in charge at the DNC.