Just another word invented by the left to call someone who is not center or left an idiot for not submitting to standard left-wing protocol. Basically an inane insult repeated mostly by people who heard it from their parents and their friends.
The word radcon was uttered many times at the Kos convention because the participants needed a unifying word to rally against those with opposing views; those who didn't like left-wing bloggers and were (gasp) on the right.
by the prog rock man December 26, 2007