Political statement murals, streetart and graffiti

Sources:
http://gothamist.com/2008/03/25/obama_in_brookl.php
http://aavrmag.com/?p=176
http://www.flickr.com/photos/tracy_collins/2233371418

I'm waiting for more. If you see some, please submit it.
[other delegates are welcome, if there's any dedicated murals for them]