Here's a great way to support Barack Obama if he is your candidate or if you like to purchase original artwork. The artist Shepard Fairey has created a limited edition silk screened poster of Obama and 100% of the purchase price is a contribution to his campaign.
Here's what it says on Fairey's wikipedia entry:
Frank Shepard Fairey (born February 15, 1970 in Charleston, South Carolina) is a contemporary artist, graphic designer and illustrator who emerged from the skateboarding scene and became known initially for his "André the Giant Has a Posse" sticker campaign. The Institute of Contemporary Art, Boston calls him one of today's best known and most influential street artists.