Ward Sutton provides an interesting analysis of political posters and campaign logos over at the New York Times.
He takes on both Democrat and Republican logos, and delivers a fairly balanced assessment of the logos he critiques. There seems to be very little political snarking coming from Sutton. You might want to infer Sutton's political leanings because he is an artist, published in the New York Times, and his comments on the Bush/Cheney poster from 2004 shown at right. But he takes the time to skewer the imagery used by both sides of the aisle in their campaigns.
In particular, I enjoyed the critique he leveled on the Fred Thompson poster. Sutton's comments on Thompson's poster reveal, in my opinion, how much the campaign poster can really be an extension of the candidates campaign - intended or not.