Has MORI worked out why polls overstate Labour?
Are too many public service workers included in samples? The overwhelming characteristic of British political opinion polling for decades has been the constant over-statement of Labour position in relation to the other parties. This came to a head at the London Mayoral election where the three phone pollsters were producing very different figures from the online firm, YouGov. To their great credit ICM and Ipsos-MORI did something about it. The former made some adjustments to its approach while the latter…