I am scraping the edges of my memory here, but I am fairly sure that opinion polls in my childhood (for the elections of 1970, 1974 and 1979) quoted four percentages: Conservative, Labour, Liberal and ‘Undecided’. Nowadays no figure is quoted for ‘Don’t knows’, and party support is contrived to add up to 100 per cent.

In praise of the ‘Don’t know’ voter
It’s the last-minute swingers, not the ideological warriors, who make democracy function

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