Nate Silver: “The 2017 election therefore seems to be a case of an overcorrection. The pollsters apparently did a good enough job of weighting the raw samples properly, which got them fairly close to the right outcome. Then on top of that, some of them gave extra weight to the Conservatives through their turnout models. As a result, they discounted signs of a youth-driven Labour turnout surge. As was the case in the U.S. with Bernie Sanders, younger voters turned out in a big way for Labour’s left-wing leader, Jeremy Corbyn.”
“It’s one thing for a pollster to get an outcome wrong because voters fail to turn out when they say they will. But if voters tell you they’re going to turn out, you ignore them, and they show up to vote anyway, you really don’t have much of a defense.”
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