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Except the last election which slightly underestimated the Labour vote. One of the reasons given for that is that polling companies adjusted their methods to take account of this and adjusted too far. They're constantly refining their methods to improve their sampling otherwise they'd go out of...

The polls for the US presidential election were absolutely spot on - they nearly all predicted a narrow win for Clinton and they were bang on. What foxed them was that the winner of the popular vote didn't win the election but it would have been very difficult to predict that. The polls for the...