Anyone who wants a factual and realistic rundown on the extent to which right-wing extremists like Matt Hale play a role in the mainstream conservativism's electoral efforts, try this report, from the Center for New Community:
Party Crashers: White Nationalists and Election 2000
Of course, this report came out before Buchanan selected a black woman as his running mate, a decision that sent virtually all of his support among white nationalists fleeing to the mainstream GOP. Note, for instance, that Matt Hale, Don Black and David Duke all wound up endorsing George W. Bush.
(oh, and you can buy his great book here).