Every month former Number 10 pollster James Johnson joins Matt for the Times Radio Focus Group. They look at why the parties find focus groups so useful, and how the views of crucial swing voters have changed as we head into an election year.

Plus: A taster of the latest episode of How to Win an Election, where political masterminds Peter Mandelson, Polly Mackenzie and Daniel Finkelstein discuss how to write jokes for politicians and how to avoid becoming the punchline. 

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