From now until Election Day, an artist in Brooklyn is calling on peers to simply circle round public objects (manhole covers, storm drains, pipe caps, etc.) making them into large Os, and then chalking the letters 'bama' to the immediate right of the object in the street or sidewalk, so that it looks like [ROUND OBJECT]bama. The point? Get people to think "OBAMA!" whenever they see an O-shaped object in public.
(Photo: O for Obama in NYC.)