Buchanan can be described as a Southern populist, as can Pat Choate and Ross Perot, whose populist sentiments appear to have triumphed over their progressive principles.
Buchanan, Choate, and Perot have all run for political positions. 
mnli hypothesis: Buchanan, Choate, and Perot have all run for political positions.  premise: Buchanan can be described as a Southern populist, as can Pat Choate and Ross Perot, whose populist sentiments appear to have triumphed over their progressive principles.