[...] Anyone who doubts the efficacy of the focus group should watch the 2019 British docudrama Brexit: The Uncivil War. Starring Benedict Cumberbatch in the role of the Leave campaign boss Dominic Cummings, one of the drama’s most powerful scenes is set in a focus group.

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Known principally for his political commentaries in The Dominion Post, The ODT, The Press and the late, lamented Independent, and for "No Left Turn", his 2007 history of the Left/Right struggle in New...