I did that a long time ago, the Bush images are okay and even funny.
The Obama images are banned.
Both tee shirts were submitted to multiple places, the bush one is still for sale. The Obama one was immediately banned.
Here is the Bush shirt for sale at CafePress:
www.cafepress.com/bushtest
I set the price exorbitantly high so that nobody actually ordered one of either. It was just a test.