ThinkGeek have these two very cool political parody mashup tees for sale. Unfortunately they are for sale this weekend only.
By the the time I checked, Robama was already the front-runner but their is still time to cast your vote by purchasing one of these tees.
The Mitt Romney Rambo tee is pretty cool and I think that any Romney supporter would be happy to wear it but Robocop is cooler than Rambo and Obama is cooler than Romney so I think we have a winner already.
Both tees are done in the style of the iconic Shepard Fairey Obama poster.