According to the AP analysis, Assembly Democrats enjoyed an outsized number of seats in relation to their share of the vote in 2016, when Republican candidates for the Assembly won about 15 percent more votes than Democratic candidates. Democrats won 37 of 65 House seats, theoretically five more than would be expected based on their statewide vote share.
The AP analyzed the results of last fall's USA and state House elections across the nation, examining the percentage of races lacking major party opposition and calculating state partisan advantages using a statistical method created to detect potential political gerrymandering.
The AP analysis addressed how much of that is caused by voter preference and how much is caused by partisan gerrymandering. The data also doesn't identify any particular districts where the legislative map might give Republicans a boost. South Carolina's lone Democrat in Congress represents a district gerrymandered as majority minority.
But "part of it is the gerrymandering issue, in that districts are simply drawn in such a way that it is very difficult" for Democrats to win in many parts of the state, Beatty added. "Do we want the members of the legislature drawing the maps to pick their constituents, or do we want the voters to pick their representatives?" It showed that Ohio provided the GOP with 1.6 extra U.S. House seats, the fifth highest nationally among pro-GOP states, and 5.23 extra seats in the Ohio House, the 12th highest nationally.
At least two-thirds of the commissioners must vote to approve a map. In late 2016, a federal court struck down 28 state House and Senate districts as illegally race-based, and the U.S. Supreme Court upheld the ruling earlier this month.
Republicans dominate the Wyoming Legislature without relying on the old political trick of gerrymandering, or adjusting political boundaries to gain an unfair advantage in elections, an analysis by The Associated Press found.
A previous efficiency gap analysis conducted by Simon Jackman, a former professor of political science and statistics at Stanford University, found that the Republican advantage was even higher in the 2012 and 2014 Missouri House elections. And in Georgia, which has 14 U.S. House districts, four Republicans and one Democrat ran unopposed by the other major party. Nevada's districts were decided by a court, but Republicans complained at the time that they appeared more favorable to Democrats. Democratic House Whip Carolyn Hugley criticized it as gerrymandering meant to create safer Republican seats.
Republican House Speaker David Ralston has said lawmakers were merely "trying to put communities of interest together".
The chief architect of a Republican legislative redistricting plan has previously said politics played a key role in drawing lines, but in ways that helped incumbents in both parties. Del.
Several Democratic Georgia lawmakers teamed up with Republican state Sen.