Jonah Goldberg's symbol (on his book cover) for liberalism is dead on target - it pins liberalism firmly to the dissecting board with the best and funniest icon I've ever seen for liberalism:

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Blade: "more educated and literate people than Justabubba"

Justabubba: "that would include everyone"

http://politicalforum.com/showthread.php?t=27847