A primary goal of a presidential campaign is to incrementally increase margins of support among volatile and persuadable demographic groups like single women angered by attempts to restrict access to contraception or voters with long commutes worried about gas prices.
A second goal is increase turnout among supportive voting blocs — conservative whites in the case of Republicans, African-Americans in the case of Democrats. This goal is accomplished most often with polarizing tactics like the exploitation of wedge issues.
The target constituencies can be huge — white men, Hispanics, seniors – or, with the emergence of sophisticated micro-technology, smaller slices of the electorate, ranging from laid-off manufacturing workers to women golfers.
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