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Over the last 50 years, both major U.S. parties have engineered maps that advantaged their own candidates in particular states at different times: Republicans secured durable advantages in many Sun Be...
You asked for “letter grades for bias” for the top 20 worst gerrymandered maps. Available sources point to two established grading tools — Princeton’s Gerrymandering Project (the Redistricting Report ...
Maps used in 2024 produced clear, state-by-state advantages: the Brennan Center estimates Republicans gained about 16 extra House seats nationwide versus “fair” maps, with Texas and Florida among the ...
Redistricting after the 2020 Census reshaped the 2022 battlefield: independent commissions and courts produced notably more competitive Mountain‑West seats while partisan mapmaking in several Southern...
Measured several ways, the biggest state-level disparities between vote share and U.S. House seats in recent redistricting cycles have been flagging Texas, California, North Carolina and Wisconsin — b...
Scholars and toolmakers commonly use a handful of quantitative metrics — notably the efficiency gap, mean–median difference, partisan bias, and declination — to flag partisan asymmetry in district pla...
Massachusetts currently holds , a pattern that experts attribute both to the geographic clustering of Democratic voters and to a congressional map that PlanScore judged more skewed than 95% of plans n...