 
Once again, the NewsFutures visual representations are criticized:
The [] image with the heads is what Tufte calls chart-junk. While 48 is abt. 50% bigger than 30, because they scale a 2d image, Hillary’s head looks 4 times as big as Obama’s.
Read Emile Servan-Schreiber’s rebuttal, circa May 2007, and decide whether you side with him or his numerous critics.
EJSS has a fanboy who loves the NewsFutures visual representation of the primaries:
Great visual display of presidential prediction market
http://tech.puredanger.com/2007/06/18/prediction-visual/
That blogger does not give any argument, though.
UPDATE: The guy is a software engineer.
http://tech.puredanger.com/about/