I really enjoyed the online exhibit designforobama.org. A gallery show, Manifest Hope, took place last year, showcasing artwork inspired by the Obama campaign. In October of 2009, the book Art For Obama, came out, and is available for purchase at this link.
Above is an image from Justin Kemerling - he is an amazing designer and activist -please check out his work here. I hope you are as inspired as I was by his beautiful design work, as well as his willingness to devote his time and talent towards causes he believes in.