You just can't stop lying.
By the late 1960s, Buckley had abandoned his segregationist views. He had started to recant his earlier position in the mid-1960s. A large part of it was seeing other segregationists in action. It forced him to witness exactly how wrong his original views were... and he did the right thing; he abandoned them.
Something Buchanon has never done. He's only gotten worse with time.
Source:
https://en.m.wikipedia.org/wiki/William_F._Buckley_Jr.#Views_on_segregation_in_the_South
Again, I only pointed out that all you can do is attack the messenger. Pat Buchanan has books published by respected publishers, appears on respected TV shows. Attends the Catholic Church, receives Communion. I don't see any problem here.
Again, let's make sure now, one has to accuse another of lying because they obviously told a falsehood, a big fib, that William Buckley hounded Pat Buchanan out of the Republican Party, apparently Buchanan left of his own accord to run for President. But we all may have problems with what we say. Nonetheless, Buckley stood up for segregation, I have not seen this charge on Buchanan, whether Buckley later abandoned his position, comfortably many years later when such views were then, not in vogue.
This is a discussion forum so don't berate or deride others if you simply can not put together more than a few sentences.
These links to VDare or whatever, do not mean anything any more than if one condemned this forum because someone spoke badly here. I have seen those links before, Pat Buchanan does not own Vdare, they may post some of his columns just like Alan Keyes' organization, Keyes is a black man, Renew America.
http://renewamerica.com/