I found this video online, I don't know how many out there may have seen it but it is very interesting how people react to his presence. Also notice that there is a woman in the rally who may be Mexican, whom he calls a 'coconut', I take that to mean "brown on the outside, white on the inside". I don't know who he was, but I give him props for the courage to walk into a situation that guaranteed some physical danger.
[Update: I originally posted the file from Break.com, it loaded too slow so I've changed it to the Youtube video instead... Seems to work better]