The AP report singled out Michigan, North Carolina, Pennsylvania, Wisconsin, Florida, and Virginia as examples of battleground states where Republican-led redistricting after the 2010 census led to a large GOP advantage in elections for the U.S. House and state legislatures. The data also doesn't identify any particular districts where the legislative map might give Republicans a boost.
The 2016 presidential contest was awash with charges that the fix was in: Republican Donald Trump repeatedly claimed that the election was rigged against him, while Democrats have accused the Russians of stacking the odds in Trumps' favor. And they moved Republican-performing areas into closely divided districts held by Republican incumbents.
The state's congressional map was deemed unconstitutional and redrawn by order of federal judges in 2016, but legal challenges to redraw state House districts are tied up in appeals. "Hats off to the Democratic litigators".
The Associated Press scrutinized the election outcomes of all 435 U.S. House races and about 4,700 state House and Assembly races a year ago using a new statistical method of calculating partisan advantage created to detect potential political gerrymandering.
The AP also calculated efficiency gap scores for the U.S. House elections, though experts caution those measurements are less statistically meaningful in states with few districts.
Even with the new lines from previous year, Virginia's congressional district favors the GOP, the AP's analysis shows.
Democrats won 57 percent of Colorado's state House seats in November, even though Republicans won 50.4 percent of the statewide vote. That helped provide the GOP with a comfortable majority that stood at 241-194 over Democrats after the 2016 elections - a 10 percentage point margin in seats, even though Republican candidates received just 1 percentage point more total votes nationwide.
The AP excluded state senate chambers from its state data because not all seats were up for election past year.
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What if the CBO score is as bad or worse than the House bill? Senate Majority Leader Mitch McConnell will have none of it. The White House has said it is committed to existing sanctions and has not taken a formal position on the senate bill.
The number of Missouri House races lacking major-party opposition has been on the rise.
"Truly, about a third of the seats are competitive, and that is the best you can do", Jones said.
Districts underwent dramatic changes that broke decades of precedent: The map shifted whole counties and some of the state's larger cities into new congressional districts, and pitted two Democratic congressmen against each other to remain in Congress. Mapmakers apparently analyzed voting patterns of individual wards.
"A favorite thing to do is to cry foul and say "gerrymander" very loud", Jones said. The Legislature overrode the veto, and the state Supreme Court later found the plan constitutional.
He'd like to see nonpartisan legislative staff draft initial maps and a supermajority consensus required by redistricting and reapportionment panels. So a party that receives 55 percent of the statewide vote could expect to win 60 percent of the legislative seats.
It usually works by either splitting up voters from an opposing party across several districts to dilute their vote-called "cracking"-or concentrating them in one district so their votes are over-concentrated on a single race - called "packing".
Pennsylvania's 16.2 percent efficiency gap favoring Republicans was the sixth highest among states previous year.
AP also found that the drawing of districts for hundreds of USA and state legislative districts gave Republicans a real advantage.