[West Coast Conservative]

Moonbat is a pejorative political slogan coined in 2002 by Perry de Havilland of "The Libertarian Samizdata," (http://www.samizdata.net/blog/) a libertarian weblog. [1] (http://www.samizdata.net/blog/archives/000615.html) The term enjoys great currency in the libertarian blogosphere, where it is used to disparage modern liberals, peace protestors, and other ideological opponents. Wikipedia

[HuntsvilleTxVeteran]

He must have come up with it in early 1950 because I have used it since then.

It could be, it was just borrowed by the LIBELtarian party.