Partisan Dealignment in the American Electorate: Itemizing the Deductions since 1964

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Abstract
According to the SRC-CPS surveys, the proportion of Americans identifying with a political party declined sharply between 1964 and 1976, from approximately 75 percent to 63 percent. In order to cast some light on the reasons for this dealignment, we examine the contributions made by the changing age composition of the electorate, the entry of new voters into the electorate, the party desertion among voters already in the electorate, and the suppression of age gains in partisanship. These four sources are shown to explain close to 100 percent of the aggregate decline from 1964 to 1976, with the single largest contribution made by entry of new voters. Nevertheless our findings indicate that the decline occurred throughout all age cohorts and suggest the potency of dealigning period forces. These forces simply had their strongest effect on those voters with predictably the least resistance, the youngest cohorts.

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