I think you're right about the police not allowing face covering masks. I saw the police going after some of the anti-President Bush nuts who were wearing masks at the Oscars rally. Plus, I wouldn't stand near anyone who even remotely resembled a sheets wearing Senator Byrd type.
I like your idea about LA (heart) W. banner. I'm going to try and make a huge one. Want to help me hold it, my Romanian brother?
Should be no problem to wear a rubbery likeness of Her Heinous...