One of the roles of liberal iconography is to envision the future. By putting the desired result of liberal activism into graphic form, liberals call upon the forces necessary to make it so.
Such is the case with this graphic from the site Imprison Bush. It shows George W. Bush behind bars, after an impeachment, imprisoned. He looks kind of pathetic, and humbled, yet his mouth is still opened, as if to make a last ditch plea for a pardon from his succcessor, whoever that may be.
Making a graphic like this could be likened to a modern-day voodoo doll, with the irrational hope that by making Bush vulnerable in a picture, Bush could become vulnerable in real life. In more practical terms, however, the graphic is tool to expand the imagination of Americans, and provoke a debate that includes the possibility that George W. Bush could actually be held accountable for his crimes