I'm a big fan of the political concept costume: Last year I wore a Kansas shirt, carried anti-abortion propaganda, and was "What's the Matter With Kansas." Similarly, I have a different costume picked out for this year and so can't use this, but if you're hard up for ideas, a long beard, a white robe, and a water pipe will make a good "Bong Hits 4 Jesus." In any case, let's give desperate Googlers a hand up and collect some ingenious costume ideas in comments.
Related: In case you wanted to carve a pumpkin into a presidential candidate...
