On November 7, 2016 — one day before the presidential election — mainstream polling suggested that Hillary Clinton’s chances of being elected were at or above 80 percent. Relying on data and surveys that systematically underestimated Donald Trump, the nation’s leading news publications ran headlines declaring, “Trump’s chances of winning approach zero.”
The rest, as we all know too well, is history. Prior to 2016, polls provided useful and relatively accurate political forecasts. But today they can no longer be trusted—even when Trump isn’t on the ballot. While 2018 midterm polls predicted more accurate overall results than 2016, they still underestimated Republicans in several key states and races.
More @ The Hill
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