The Flaw in America's 'Holy Grail' Against Gerrymandering

A statistic called the efficiency gap seems like a simple way to measure partisan gerrymandering. It’s easy to calculate and relies on actual election results, not hypothetical results, something called for back in 2004 and 2006 when alleged cases of gerrymandering were found by the U.S. Supreme Court to be too speculative to be ruled unconstitutional. However, the efficiency gap fails to account for key factors such as political geography, making it less of a silver bullet than originally hoped.

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