Backing Buchanan (of the Nixon RINO crowd) is about as RINO as one gets.
Well then, maybe he "evolved" since 1992. All I can tell you is that he was one of my top favorite talk show hosts for years, and I was sorry to see him go.
See if you can find any of his columns online. He definitely is not a RINO. I know, because I can't STAND RINOs, and was chastised by many here on FR during the 2014 mid-terms for arguing that conservatives should not vote for any member of the GOPs establishment.