Powers actually began her fall into oblivion when she stated that she didn’t see any voter intimidation at all. She said what SHE saw was a black man standing there with people going by him to vote. That is what sent Megyn off.
In this case, the audio evidence (the New Black Panthers taunting and threatening the prospective white voters with racial epithets, etc.) is just as important as the visual. The audio evidence is not present on the film that I've seen but voters and poll watchers have testified to what the perps said.