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It seems to me that, just as ‘peak oil’ refers to the “the point in time when the maximum rate of petroleum extraction is reached, after which the rate of production is expected to enter terminal decline,” so ‘peak pale’ ought to refer to the point in time when the maximum relative rate of white vote extraction is reached by the GOP, after which the party’s rate of election is expected to enter terminal decline.
John Holbo, via Crooked Timber