I've got a lovely bridge for you, Guest - just watch out for billy-goats...
Spaw, you say that the far ends of the political spectrum are the ones that get things done. In that case, the KKK are surely the greatest army for good in the US, no?
The radical wings of any group are the ones that you should IGNORE! It's the radical Republican wing of the IRA that's keeping up bombing. It's the radical Orange wing of the Unionists that's keeping up marching. It's the radical Buddhists who gassed Tokyo. It's the radical right policemen who killed Goodman, Schwerner and Chaney. It's the radical anti-abortion campaigners that attack and kill doctors. It's the radical Muslims who regard women as a disposable possession. I'm sorry, but I've got no faith in anyone who can call themselves a "radical" anything.
Where I come from, "liberal" means that you recognise the rights of other ppl to have opinions different to your own, and you will defend the rights of ppl to have their own opinions. If this is a bad thing, then shoot me for being a liberal.