I've just heard an interesting interview with an expert on fringe right-wing movements such as the Patriot groups and their militias. To listen to the programme or download it, visit this NPR page.
What's particularly striking is that these groups have recently become more mainstream via the Tea Party movement which many of the activist have joined. Some of their more outlandish ideas have received sustained coverage from Fox News : last year Glenn Beck looked at their claim that FEMA (the Federal Emergency Management Agency) has created detention camps in which conservatives would be rounded up after a liberal take over of the governement. He examined this conspiracy theory during three shows before debunking it.
Moreover the paranoid rhetoric of these groups is gaining the Republican Party, as some GOP officials are trying to take advantage of the popular discontent provoked by the federal government's policies (especially the stimulus package and the healthcare reform overhaul passed by Congress). To see examples of this, you can watch this video from a left-wing MSNBC show (especially the last two minutes)
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Finally here's a comparison between the civil rights movement's strategies and those of the anti-tax/Tea Party movement :
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