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One Way To Spot A Partisan Gerrymander
Without hyperbole, this may be one of the most important issues faced in our democracy.On March 26, challengers to North Carolina’s congressional map will argue before the Supreme Court that it is a partisan gerrymander — that is, the district boundaries were drawn to benefit one political party, the GOP, in a way that violates the Constitution. The challengers are using a variety of quantitative tools to make their argument, including a metric called “partisan bias” that tries to evaluate how skewed a map is by looking at the number of seats a party would have won in a hypothetical election in which the vote was evenly split between Republicans and Democrats. Here’s how that metric works and what it says about congressional maps going back a few decades.