Others have written about the overarching themes of "Mosh" better than I can (e.g. Kid Oakland). Supportive actions have been suggested and the symbolic expressions of solidarity (e.g. Black Hoodies on 11/2).
Eminem video to get played on TRL
the politics of Mosh by kid oakland
CALL TO ACTION: Black Hoodies on 11/2 by hyperbolic pants explosion
There's the brutal element left unaddressed: the implied threat of violence. Mosh pits aren't peaceful and organized and Mosh isn't a liberal video.
Many Kossacks have seemed squeemish or blind to the implied threat of violence in Eminem's video and no one really seems to want to point out the crude anarchist imagery.
Nevermind the black clad legions marching the streets to throw out the government. Nevermind the absence of any structure to the mob or organization orchestrating the movement. (spontanious class consciousness?) Nevermind that when Private Kelly is ordered to report he revolts against his orders. (rejection of state authority) Nevermind that "rubberband man" Swift gets beat by the police then flips them off. (rejection of state authority) Nevermind that Tenant 508 revolts against the injustice of her landlord. (rejection of private property)
What are we going to understand from the mass standoff between Moshers and the police? This isn't peaceful, nonviolent disobedience. This isn't sitting down and saying "I am not resisting" and taking pepperspray. This is in-your-face, break open the fire hydrant and storm the palace mass action.
This, ladies and gentlement, is the Black Bloc of November 2nd. You remember Seattle WTO and Quebec FTAA and the rest of them. This is Argentina, not Selma, Alabama.
The implied threat of "Mosh" is:
There will be no voter suppression. There will be no GOP mercenary monitors challenging our right to vote. You will not turn us away from the polls. Not even if you line up the police in riot gear to keep us out. We'll push on by. We'll run you down. We'll kick your ass and cast a ballot. Oh, and Mr Senator? That goes for you too."
So, are you really ready to join the Black Bloc on November 2nd?