In case you've somehow missed it, the posters that Shepard Farey created for Barack Obama are fantastic, and bound to pull in a whole new audience that probably haven't previously had any interest in the presidential race. From obeygiant.com:

"I believe with great conviction that Barack Obama should be the next President. I have been paying close attention to him since the Democratic convention in 2004. I feel that he is more a statesman than a politician. He was against the war when it was an unpopular position (and Hillary was for the war at that time), Obama is for energy and environmental conservation. He is for healthcare reform. Check him out for yourself  www.barackobama.com. Proceeds from this print go to produce prints for a large statewide poster campaign.
Thanks.
-Shepard"

Some related reading: Analyzing campaign typography, The Hardest Working Presidential Candidate Logo