I generally like Buchanan and think he's smart. I don't always agree with him, but I always enjoy reading him because he's an idea guy, not just a "yeller". Your challenge piqued my interest. I can't say that I've read everything he's ever written, however, even I, who, as I said, generally like him, find a thread of certainly anti-Israel thought in his writing (at least he's virtually NEVER positive on Israel), and a hint of anti-Jewish thought as well. My gut tells me he doesn't like Jews, but of course I can't prove that.
I'm attaching a link to an article that seems to be researched pretty well. Wonder what you think of it?