Wow, so much fail in this thread.
1) It doesn't matter whether Breitbart edited the tape or not. It is his job as a responsible journalist to find out ALL the facts before reporting a story and claiming it as fact.
That is not to say he could not air the edited version, but that the way the story is presented must in line with the fact that not everything is completely known. Meaning, if Breitbart had stated, I received this video from a source and it seems to show X person doing Y bad thing then this would not be a libel or slander case. Why? Making a hypothesis based on the evidence he currently had is perfectly legal and acceptable.
The problem is he stated as a fact of statement that she WAS racist and the video he originally showed was his proof for that statement of fact.
2) Her grievances with the whitehouse, NAACP, USDA, or whatever have zero bearing on her grievances with Brietbart. They are not mutually exclusive. She also has the right to take up complaints against all parties involved.
3) While she has a grievance against the NAACP and whitehouse, they also made good on her grievance by offering her basically an "out of court" settlement. She got a better job and probably some side benefits we will never know about. By doing this, the white house and other parties involved rectified their own part of the error. By doing so, chances are she signed a non retaliation agreement to not sue them by accepting the "offer" of an apology.
4) While the white house and other parties had ways out of court to settle their wrongs, Breitbart and company do not. What they did was wrong and illegal. She has a valid grievance and she needs to take it up. Political leaning be damned here. This is a (excuse the pun) black and white scenario. Personally, I do not care whom is favoring whom, or belongs to party X. It does not matter in this case. Breitbart and Fox, to put it simply, fucked up here. There is no excuse for their behavior. They need to feel the consequences for their actions or they will do this again.
Again, I would have had no problem with Breitbart over this if he had just simply alluded to the allegation instead of claiming it as fact. It does not matter if he personally edited the video or not. The defamation comes strictly from his statement. The video is peripheral.