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Ultimately, Mr. Siegel laments the contempt and hostility so many liberals have shown over the past century toward so many of their fellow countrymen who are neither among the right-thinking wealthy nor poor enough to evoke their pity.

Daniel DiSalvo is an assistant professor of political science in the Colin Powell School at the City College of New York-CUNY. He is the author of “Engines of Change: Party Factions in American Politics” (Oxford, 2012).