Measuring the effects of gerrymandering
The Supreme Court appeared split on whether Wisconsin Republicans gave themselves an unfair advantage when they drew political maps to last a decade. Among the two dozen most populous states, there were nearly three times as many with GOP-tilted House districts, according to an AP analysis using the efficiency gap.
U.S. House* races, 2016
← MORE DEM ADVANTAGE
MORE GOP ADVANTAGE →
Efficiency gap (%)
*Only states with six or more U.S. House seats are represented. Experts caution that measuring the efficiency gap in states with few districts is less meaningful.
Republicans had greater advantage in state House races
The AP analysis of last fall’s state House and Assembly elections found four times as many states with Republican advantages in converting votes into seats than Democratic ones.
State House* races, 2016
← MORE DEM ADVANTAGE
MORE GOP ADVANTAGE →
Efficiency gap (%)
*Includes states that held partisan elections for all of their state House or Assembly seats in 2016.