“Instead, then, of trying to distance himself from the anti-Semitic associations of the old America First movement, Buchanan moved with all due deliberation in the opposite direction, and kept right on moving for the next ten years. By the time the Bush Doctrine was enunciated, the whiff of anti-Semitism emitted by his writings had become so strong that they helped to discredit the isolationist ideas that might otherwise have gained him an audience beyond the small cadre of his paleoconservative followers. An American success in Iraq—which he called the main “laboratory and proving ground” of the neoconservative foreign policy Bush had “imposed on Ronald Reagan’s party”—threatened to marginalize him even further. On the other hand, if Buchanan’s ideas about the American role in the world were to be vindicated by a failure in Iraq, their anti-Semitic emanations might no longer be so great an obstacle to the expansion of his influence. For anti-Semitism disguised as anti-Zionism (and often not bothering to disguise itself at all) had been making a strong comeback after being banished from respectable society since 1945, when knowledge of the Holocaust had revealed where this most ancient of bigotries could end if permitted to go unchecked.”
Excerpt From: Podhoretz, Norman. “World War IV.” Doubleday, 2007-09-11. iBooks.
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Buchanan was quickly marginalized by the right for his anti-Semitic tilt. The left was far more tolerant of more odious comments from Noam Chomsky and others.