The Problem of Identity Politics
This lady wasn't too happy with the fact that the party big wigs decided that Michigan and Florida will only get 1/2 of their delegations seated. She was unhappier that the rules committee tossed her (and many others) out of the room.
When you play identity politics, as the Democrats have for decades, you can't help but run into problems when the identities clash. Truthfully, this should have been banner year for the Democrats, hoisting the identity of the first black nominee with a chance onto their mantle. The problem is that eight months ago the party thought it would be a banner year when they did that with the first serious female nominee.
Now the women are pissed off at the black guy, the black guys are pissed off at the woman, and the party of unity is a fractured group of individuals, pissed that their identity isn't the one being recognized.
Here's an idea for their party to try in 2012, run on ideas, not identities, and see if it works out better.