“One Way to Spot a Partisan Gerrymander”

A nice analysis by FiveThirtyEight using the partisan bias metric and covering North Carolina’s congressional plan (extremely skewed in Republicans’ favor), the court-drawn remedial plan in Pennsylvania (almost perfectly neutral), and all congressional plans currently in effect (exhibiting a significant pro-Republican tilt).

To support their argument that the 2016 map is a partisan gerrymander that disadvantages Democrats, the challengers use an expert’s finding that the map’s partisan bias in the 2016 election was the largest in the state since at least 1972. In the chart below, which looks at the state’s congressional elections since 1992, you can see that the partisan bias against Democrats increased dramatically in this decade.

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