Abstract
Despite the measured pace of American elections, there have now been a number of presidential campaigns since the advent of survey studies of voting. However sparingly, political history slowly has added to the set of distinct configurations of men and events which comprise a contest for the Presidency. The set is still small, whatever the impression created by massed thousands of interviews or by the accompanying files of election returns. Yet it is now large enough to be pressed hard for evidence about the sources of electoral change.A primary virtue of measurements extended over a series of elections is that they can throw light on the problem of change. So long as the earliest voting studies were confined to cross-sectional relationships, they could deal only very inadequately with changes superimposed on these relationships or with changes in the relationships themselves. In the case of Lazarsfeld's enormously influential Erie County study in 1940, the natural limitations of a single-election study were compounded by the investigators' misfortune in choosing a campaign whose dominant personality and principal issues differed little from those of preceding elections. I have often wondered whether the static social determinism of The People's Choice would have emerged from a campaign in which the tides of short-term change were more nearly at flood.I shall examine here some sources of change which are richly evident in the presidential elections of the last two decades.

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