This looks very good: Republican Populist: Spiro Agnew and the Origins of Donald Trump’s America by Charles J. Holden, Zach Messitte and Jerald Podair.
Wall Street Journal: “It is undoubtedly true that many of Agnew’s themes would be echoed by Mr. Trump half a century later and that the Silent Majority of the late 1960s, with its rejection of liberal elites and radical voices, prefigured the populists who propelled Mr. Trump to the presidency. But if any ’direct line’ exists from that era to today, as the authors claim, it is more properly drawn from the starting point of Richard Nixon.”



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