I've able to get these two very hard to find lithos. The one on the left is the hard-to-find 1997 San Diego Comic-Con Uncle Sam litho which was only available at that venue. The other one is the sold-out "Time for a Change / Super-Obama" print. There were two versions of this litho. Version 1 was sold at the 2008 San Diego Comic-Con and latter reissued on Inauguration Day to celebrate Barack Obama's first day as President of the U.S. This second version came with the caption and date you can see below.