Two Madison, Wisconsin residents fill out their early voting ballots in front of the city's capitol. John Hart / AP
Any subset of the population can be decisive when an election is tight enough and the electorate is large enough.
In Pennsylvania, for example, 13 million people live.
Between 1/20 and 1/50 of Americans have red hair, so in this state the red-haired voters (between 50 and 200 thousand) are theoretically more than enough to determine if they fall on the Democratic or Republican side ...
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