One of the biggest challenges facing those who seek to understand U.S. elections is establishing an accurate portrait of the American electorate and the choices made by different kinds of voters. Obtaining accurate data on how people voted is difficult for a number of reasons. Surveys conducted before an election can overstate – or understate – the likelihood of some voters to vote. Depending on when a survey is conducted, voters might change their preferences before Election Day. Surveys conducted after an election can be affected by errors stemming from respondents’ recall, either for whom they voted for or whether...
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