Pat Buchanan is generally regarded as a political extremist. And yes, I'm very familiar with him based on his own speech and writing, not someone else's characterization of it.
Perhaps because he hasn't run for office in a quarter century? And while I find many of his views odious, he's more coherent and restrained in his rhetoric than Trump - he is a fixture on a weekly TV roundtable political TV show called *The McLaughlin Group if you want to sample his communication style.