“Barack Obama often talks about the grass-roots nature of his candidacy, but he may be running the most successful stealth marketing campaign by a presidential candidate ever.

“Since the fall, pro-Obama street art has popped up all over the country, primarily in urban areas such as New York, Chicago, Seattle and LA.

“In several cases, the Obama campaign has been directly responsible - although it has very carefully kept plausible distance, for the purposes of “street cred” and obeying the law. (Graffiti, of course, is illegal).” [NYP]