Your Mobile Phone Is Killing the Polling Industry

Everyone wonders why presidential campaign polls are all over the place. Here’s one big reason.

Donald Trump likes to pepper speeches with references to whatever poll puts him ahead of Hillary Clinton, be it nationally or in a battleground state. But any political junkie mainlining cable news in the most divisive U.S. presidential campaign in modern history has got to be wondering why, increasingly, one can find a poll result to fit any outcome.

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