Politics and art. Both are sometimes about appropriation.
Artists borrow the style -- and sometimes the imagery -- of other artists. Politicians recycle themes, slogans and even attack lines ("flip-flop," anyone?) from other politicians.
So it didn't surprise Shepard Fairey, the Los Angeles street artist whose "Hope" poster of Barack Obama thrust him into the political spotlight, when he learned his work had been remade.
In fact, spoofs have proliferated. One, an anti-Obama poster spotted at the Republican National Convention, is nearly identical to Fairey's version, except "Hope" has been replaced by "Hype."