I've talked about this before on this blog and have had conversations with others. A point that comes up a lot, and I totally agree with it, is without Dean in 2004 and as the head of the DNC for the last four years, Obama wouldn't be as successful today. Obama took Dean's 50 state strategy and turned it into a way to not only win the presidential nomination but to turn the entrenched way of doing things on its head. No one else embodied the entrenched interestes and traditional way of doing things in the Democratic party more than HRC.
Anyway, this is a pretty good and shortish summary of the coming together of the two strategies and what it means for the GE.