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That view came to be embodied in a highly influential 1950 report by a special committee of the American Political Science Association, titled “Toward a More Responsible Two-Party System.” The commission, chaired by political scientist E. E. Schattschneider of Wesleyan University, argued that the parties should sharpen their ideological appeals, better highlight their differences, nationalize their internal infrastructure, and work to make their core voters more energized and engaged. Some critics could see the risks of such an approach, and they focused precisely on the threat it posed to the capacity of our system to engender cohesion. Political scientist James Q. Wilson warned in 1962 that such reforms would “mean that political conflict will be intensified, social cleavages will be exaggerated, party leaders will tend to be men skilled in the rhetorical arts, and the parties’ ability to produce agreement by trading issue free resources will be reduced.” In retrospect, he was prophetic.
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Yuval Levin (American Covenant: How the Constitution Unified Our Nation—and Could Again)