United States Electoral College
Favors largest swing states

The Electoral College encourages political campaigners to focus on a few so-called swing states while ignoring the rest of the country. Populous states in which pre-election poll results show no clear favorite are inundated with campaign visits, saturation television advertising, get-out-the-vote efforts by party organizers, and debates, while four out of five voters in the national election are "absolutely ignored", according to one assessment. Since most states use a winner-takes-all arrangement in which the candidate with the most votes in that state receives all of the state's electoral votes, there is a clear incentive to focus almost exclusively on only a few key undecided states.
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