http://www.youtube.com/watch?v=S6EgE0ZbcHA&feature=youtube_gdata_player
That'll hurt a lot more than a march. In fact, a march won't hurt them at all; and I wouldn't be surprised if those worthless, brain dead psychos gratuitously beat up the people marching.
Disneyland is an overpriced rip-off anyway, and they are not cool from a political perspective. They also treat their employees like crap, from some of the stories I read. Feel free to research it.
