A tale of two by elections – and why polls are snapshots, not predictions

On 28 August Douglas Carswell announced he was leaving the Conservative Party and joining UKIP. Five days later I published a poll of the Clacton constituency that put his support in the resulting by-election at 56%, with the Tories on 25%, Labour on 16%, and the Lib Dems and Others on 2% each: a 32-point Carswell lead.

The results on by-election day six weeks later were remarkably similar to those in my survey.

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