Are opinion polls science or fiction?
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General election 2017: Voters' views on the accuracy of the polls

Weekend polling reports have put the Conservative lead anywhere between one and 12 percentage points.

Looking at the range of results, Daily Politics reporter Adam Fleming used the mood box - an unscientific test with a box and balls - to ask potential voters what that they made of the political maths, and whether people tell pollsters the truth.

Mood box films from the 2017 election campaign

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