Photos by Vincent Ng. This past Saturday, one of the Obama posters Shepard Fairey added to the cityscape was taken down by graffiti writer MARTY -- who Razor Apple reports "has been holding down that corner for years." The Obama poster is on the corner of Houston and Bowery, and reportedly Shepard was apologetic for pasting over another writers work, but added, “however, I feel Obama being elected is very important to everyone’s future......