The One-Sentence Version
Gerrymandering has existed since 1812, but the modern crisis began in 2010 when the Republican State Leadership Committee spent $30 million on a project called REDMAP to win state legislatures in the census year, seize control of redistricting, and build a structural advantage that allowed Republicans to keep the House majority in 2012 despite receiving 1.4 million fewer votes than Democrats.
By the Numbers
| What | Number | Source |
|---|---|---|
| Year the word “gerrymander” was coined | 1812 | [12] |
| Money spent on REDMAP | ~$30 million | [2][3] |
| State legislative seats Republicans gained in 2010 | ~700 | [2] |
| State legislative chambers that flipped to Republican | 20 | [2] |
| More votes Democrats won in 2012 House races | 1.4 million | [1][2] |
| House seats Republicans held despite losing the popular vote (2012) | 234 to 201 | [1] |
| Times Ohio Supreme Court struck down gerrymandered maps | 7 | [8] |
| Competitive House seats in 2024 (out of 435) | ~69 | [4] |
| Districts Republicans controlled in post-2020 redistricting | 177 | [4] |
| Districts Democrats controlled in post-2020 redistricting | 49 | [4] |
| States where voters approved redistricting reform with 60%+ | 6+ | [4] |
Where the Word Comes From
In 1812, Massachusetts Governor Elbridge Gerry signed a bill redistricting the state to benefit his party. When mapped, one of the twisted districts north of Boston resembled a salamander. An editor at the Boston Gazette reportedly said: “Salamander! Call it a Gerrymander.”[12]
The political cartoon spread rapidly, and the word entered the American vocabulary. The irony: Gerry himself disliked the practice but signed the bill anyway. His party won 29 seats to 11, but Gerry lost his own reelection.[12]
Both parties have been doing it ever since. Virginia, North Carolina, and South Carolina drew manipulated districts in the late 18th century. Between 1872 and 1896, at least one state redrew its boundaries every single year. This was bipartisan misbehavior from the start.[12]
What Changed: Computers and Data
For most of American history, gerrymandering was a crude art. Mapmakers drew lines by hand with limited data. The results were imprecise.
Three developments changed that:
- The 1960s: The Supreme Court’s “one person, one vote” decisions mandated redistricting after every census, making it a regular high-stakes event.[4]
- The 1990s-2000s: Geographic information systems (GIS) and voter databases gave mapmakers detailed information about every household: party registration, voting history, campaign donations, age, income, race, and education.[4]
- 2010: One party used those tools at national scale.
REDMAP: How Gerrymandering Was Industrialized
The plan
In 2009, Chris Jankowski, who ran the Republican State Leadership Committee’s redistricting operation, recognized an opportunity. The 2010 elections fell in a census year, meaning whoever controlled state legislatures after November 2010 would draw the congressional and legislative maps used for the entire next decade.[2][3]
The project was called REDMAP: the Redistricting Majority Project. It targeted 107 state legislative races in 16 states, focusing on swing states where control of the legislature was within reach: Wisconsin, Michigan, Ohio, Pennsylvania, North Carolina, and Florida.[2]
Karl Rove publicly championed the concept. He wrote in the Wall Street Journal: “He who controls redistricting can control Congress.”[3]
The cost: approximately $30 million, invested in cheap state legislative races rather than expensive Senate or gubernatorial campaigns.[2][3]
The results
The 2010 elections were a Republican wave. But REDMAP ensured the wave’s effects would last a decade:
- Republicans gained approximately 700 state legislative seats.[2]
- Twenty legislative chambers flipped from Democratic to Republican control.[2]
- Republicans took full control of 11 state legislatures.[2]
- Republicans won control of redistricting in 10 of the 15 states that would be redrawing congressional maps.[2]
After the election, Jankowski declared: “Regardless of what happens in Washington, the Democrats will not soon recover from what happened to them on a state level on Tuesday.”[3]
How they used the power
Using sophisticated redistricting software, Republican mapmakers drew districts that packed Democratic voters into a handful of seats where they’d win by enormous margins (wasting those excess votes) and cracked remaining Democratic voters across many districts where they’d be narrowly outnumbered.[4]
Thomas Hofeller, described as “the master of the modern gerrymander,” was the key operative. After his death in 2018, his daughter discovered thousands of files on four hard drives and 18 thumb drives documenting his work across Arizona, Florida, Maryland, Mississippi, Missouri, Ohio, Tennessee, Virginia, and other states. A professor found Hofeller had manually entered African American voting-age population data into nearly every draft of his North Carolina mapping software.[9]
The defining data point: 2012
In the 2012 House elections, Democratic candidates received nearly 1.4 million more votes than Republican candidates (48.4% to 47.1%). Republicans kept the House majority, 234 to 201.[1][2]
This was one of only five times in American history that the party winning the popular vote failed to win the House majority.[1]
David Daley, author of “Ratf**ked,” wrote: “The Republicans spent $30 million on this and they were able to build themselves a firewall, a full Chamber of Congress for a decade.”[3]
They took credit publicly
The RSLC published a review on their own website connecting their 2010 state wins to the 2012 House majority. Republican strategist Ben Ginsberg, in an endorsement of David Daley’s book documenting the strategy, characterized it as “shadowy, but thus far, legal hacking, splicing, and dicing of congressional districts to secure Republican domination.”[2][3]
What It Looked Like in Practice
North Carolina
When courts struck down the original maps as racial gerrymanders, the legislature was ordered to draw new ones. State Rep. David Lewis, chairman of the redistricting committee, stated openly: “I propose that we draw the maps to give a partisan advantage to 10 Republicans and three Democrats, because I do not believe it’s possible to draw a map with 11 Republicans and two Democrats.”[10]
Wisconsin
Republicans drew maps in secret at a law firm’s offices. Legislators were required to sign confidentiality agreements. The result: in 2018, Democrats won all statewide offices and the popular vote but captured only 36 of 99 Assembly seats. Princeton’s Gerrymandering Project calculated the maps had a 1-in-60,000 probability of occurring by chance.[6]
The maps stood for 12 years until the Wisconsin Supreme Court struck them down in December 2023 on state constitutional grounds.[6]
Pennsylvania
The resulting 7th congressional district was so contorted that at its narrowest point it was barely wider than a restaurant parking lot, snaking through suburban Philadelphia to connect noncontiguous Republican areas.[7]
In 2018, the Pennsylvania Supreme Court struck down the maps as an illegal partisan gerrymander violating the state constitution’s “free and equal” elections clause. It was the first time a state court threw out congressional boundaries in a partisan gerrymandering case.[7]
Ohio
This may be the most instructive case for understanding why gerrymandering is so hard to fix.
In 2015, Ohio voters overwhelmingly approved a constitutional amendment creating a redistricting commission and banning partisan gerrymandering. It passed with over 70% of the vote, with support from both parties.[8]
In 2018, voters approved a second reform amendment, also with over 70%.[8]
The Republican-controlled redistricting commission drew aggressively gerrymandered maps anyway. The Ohio Supreme Court struck them down. The commission submitted new maps. The court struck those down too. This happened seven times.[8] The commission simply refused to comply with the court orders.
In 2024, reformers launched a new ballot initiative. Republican officials wrote ballot summary language stating the measure “required” the commission “to gerrymander.” Voters rejected it, apparently confused by the misleading description.[8]
Democrats Do It Too
This is not a one-party problem. Democrats gerrymander when they have the power.
Maryland: After the 2010 census, Democrats redrew a safely Republican district to be heavily Democratic. A federal court found the map “violates the First Amendment.” After the 2020 census, they drew another aggressive map. A state judge ruled it a “product of extreme partisan gerrymandering.” Both maps were eventually redrawn.[11]
Illinois: After the 2020 census, Democrats drew one of the most aggressively gerrymandered maps in the country. The Princeton Gerrymandering Project gave it failing grades in partisan fairness, competitiveness, and geographic features. The map reduced Republican representation from 5 to 3 of 17 seats.[13]
New York: In 2022, Democrats drew a heavily pro-Democratic map. New York’s highest court blocked it in a 4-3 decision, ruling it violated the state’s 2014 redistricting reform. A court-appointed special master drew replacement maps.[14]
The scale question
Both parties do it. The scale is not equal. In the most recent redistricting cycle, Republicans controlled the drawing of 177 congressional districts compared to 49 for Democrats. The Brennan Center found 11 Republican-drawn maps with extreme partisan bias compared to 4 drawn by Democrats.[4]
The reason is structural: Republicans hold more state government “trifectas” (governor plus both legislative chambers), giving them more opportunities to gerrymander. REDMAP was unique not because Republicans invented gerrymandering but because they industrialized it at national scale with $30 million in coordinated funding, sophisticated technology, and a strategy specifically designed to control redistricting for a decade.[2][3]
The Supreme Court Said It Couldn’t Help
Rucho v. Common Cause (2019)
This is the case that closed the courthouse door.
The Court combined two cases: Republican gerrymandering in North Carolina and Democratic gerrymandering in Maryland. In a 5-4 ruling, Chief Justice Roberts wrote that partisan gerrymandering may be “incompatible with democratic principles” but that “partisan gerrymandering claims present political questions beyond the reach of the federal courts.”[5]
Roberts told litigants to seek remedies through state courts or Congress instead.
Justice Kagan’s dissent: “Of all times to abandon the Court’s duty to declare the law, this was not the one. The practices challenged in these cases imperil our system of government… Partisan gerrymanders debased and dishonored our democracy… Someplace along this road, ‘we the people’ become sovereign no longer.”[5]
The catch-22
Roberts said “go to state courts or Congress.” But:
- States that tried ballot-measure reform (Ohio) faced officials who ignored the results.[8]
- State court remedies depend on the partisan makeup of state supreme courts. When North Carolina’s court flipped from Democratic to Republican in 2022, it reversed its own anti-gerrymandering ruling.[5]
- Congressional remedies (the For the People Act, the Freedom to Vote Act) have been filibustered in the Senate.[15]
And with its April 29, 2026 ruling in Louisiana v. Callais, the Court narrowed challenges on racial grounds as well. It held that Section 2 of the Voting Rights Act, “properly interpreted,” “imposes liability only when circumstances give rise to a strong inference that intentional discrimination occurred.” Critics argue that states can now claim partisan motivation (which courts can’t review) for maps with racial effects.[16][22] Correction (October 2, 2026): an earlier version called this “yesterday’s” ruling and said it made racial challenges nearly impossible. The ruling came on April 29, 2026, and this passage now quotes its holding.
What Voters Have Done About It
When given the chance, voters of both parties have consistently supported reform:
| State | Year | What voters approved | Margin |
|---|---|---|---|
| Ohio | 2015 | Redistricting commission, gerrymandering ban | 70%+ |
| Ohio | 2018 | Congressional redistricting reform | 70%+ |
| Michigan | 2018 | Independent citizen redistricting commission | 61% (carried 67 of 83 counties) |
| Colorado | 2018 | Independent redistricting commission | Approved |
| Utah | 2018 | Independent redistricting commission | Approved |
| Virginia | 2020 | Bipartisan redistricting commission | 65.7% |
California’s independent commission, created in 2008, has been widely studied. Before the commission, only 5.2% of districts had competitive elections. Afterward: 14.6%. The Public Policy Institute of California found the commission “largely satisfied expectations that it would produce plans that are fair to each major party.”[4]
Michigan’s “Voters Not Politicians” initiative collected over 425,000 signatures and carried 67 of 83 counties, including both red and blue areas. The commission includes 4 Democrats, 4 Republicans, and 5 independents, selected randomly.[4]
What Gerrymandering Does to Elections
The practical effects go beyond which party wins:
Fewer competitive races: Only about 69 of 435 House seats were rated competitive in 2024. Twenty states had zero competitive districts.[4]
Primaries decide everything: A 2022 Unite America report found that just 8% of eligible voters cast ballots in partisan primaries for “safe” seats, yet those primaries effectively determined the winners in 83% of House races. When the general election is predetermined, the real election is the primary, where turnout is low and voters are more ideologically extreme.[4]
More extreme candidates: Stanford research found that extreme candidates are winning primaries and general elections more often than at any point in at least 30 years. Safe districts incentivize candidates to appeal to their party’s base rather than the broader electorate.[4]
Representation doesn’t match the vote: In 2012, Democrats won 1.4 million more House votes but lost the House. In 2018 Wisconsin, Democrats won statewide but captured 36 of 99 Assembly seats.[1][6]
The Counter-Arguments
”Gerrymandering is just part of politics. Both sides do it.”
Both sides do it. The question is whether that makes it acceptable. Voters in both red and blue states have repeatedly voted to ban it, often by margins above 60%. The practice is broadly unpopular regardless of which party benefits.[4]
“REDMAP was just good strategy. Democrats could have done the same.”
They could have and didn’t. Democrats had no comparable national redistricting strategy in 2010. Whether that reflects a strategic failure or a difference in priorities is debatable. What is documented is that REDMAP’s architects publicly took credit for converting $30 million in state legislative spending into a decade of House control, and that the resulting maps produced outcomes where the party that won fewer votes kept the majority.[2][3]
“Independent commissions are undemocratic. Elected officials should draw maps.”
Elected officials drawing maps have a direct conflict of interest: they are choosing their own voters. Independent commissions in California, Michigan, and other states have produced more competitive elections and maps rated fairer by nonpartisan analysts. Voters who approved these commissions did so through democratic means (ballot initiatives), often by large margins.[4]
“Population sorting explains the Republican advantage, not gerrymandering”
Population sorting is real: Democrats cluster in urban areas, naturally “wasting” votes in landslide city districts. This gives Republicans a structural advantage even with fair maps. But research consistently finds that sorting accounts for only part of the advantage. FiveThirtyEight’s analysis estimated gerrymandering accounts for less than 25% of polarization, with sorting being larger. But for seat allocation specifically, the Brennan Center estimated gerrymandering gave Republicans an advantage of approximately 16 House seats in 2024, well beyond what sorting alone explains.[4]
Where Things Stand Now
After the 2020 redistricting cycle, maps were generally fairer than after 2010, due to more independent commissions, more divided state governments, and more state court challenges. But significant gerrymandering persists in states controlled by one party.
The April 29, 2026 ruling in Louisiana v. Callais added a new dimension: by holding that Section 2 of the Voting Rights Act “imposes liability only when circumstances give rise to a strong inference that intentional discrimination occurred,” the Court narrowed the federal route for challenging racially discriminatory maps, on top of closing federal courts to partisan gerrymandering claims after Rucho.[16][22] Correction (October 2, 2026): an earlier version said the ruling made it nearly impossible to challenge racially discriminatory maps in federal court. This passage now describes what the Court held.
What followed is the clearest illustration in this article of what happens when one federal route closes and the other narrows. Within days, Republican-led states moved to redraw mid-decade. Three were racing to change their maps after the ruling: Louisiana, Alabama, and Tennessee.[19] Florida, which had drafted its map before the ruling, enacted it days later:
- Louisiana suspended its U.S. House primaries by executive order on May 1, two days after a ruling in a case brought in its own name. More than 100,000 absentee ballots had already been mailed, and a state court declined to order the May election restored.[17]
- Florida Gov. Ron DeSantis signed a map drafted by his office on May 4. It has 24 districts Trump carried in 2024 and four where most voters backed Kamala Harris. DeSantis said it was drawn in a “race-neutral” fashion in anticipation of a Supreme Court ruling weakening the Voting Rights Act; that ruling came down while the Legislature was debating the map. Voters sued the same day under the state constitution’s own ban on partisan gerrymandering, which is the remedy that remains when the federal one is gone. On June 10 the Florida Supreme Court, 6-1, refused to intervene, leaving the map in place for the 2026 election.[18][23]
- Alabama convened a special session on May 4 aimed at its court-ordered map, which came out of Voting Rights Act litigation in 2023 and includes two Democrat-held seats. Legislative leaders said in a joint statement, “we have a responsibility to give our state a fighting chance to send seven Republican members to Congress”; Democracy Docket described that as an aim to eliminate both seats held by Black Democrats. After the Supreme Court vacated the court-ordered map, the state reverted to its 2023 Legislature-drawn map, which redrew Rep. Shomari Figures’s 2nd District to favor Republicans, and held special primaries on August 11. Figures and Rep. Terri Sewell won theirs unopposed.[19][24]
Correction (October 2, 2026): An earlier version of this section dated the Louisiana v. Callais ruling to May 1, 2026, and said Louisiana suspended its primaries hours after it. The opinion is dated April 29; the suspension came two days later. It also said Alabama convened its special session to eliminate both of its majority-Black districts; that was Democracy Docket’s characterization, and legislative leaders spoke of sending “seven Republican members to Congress.” And it listed Florida among the states that moved only after the ruling, when Florida’s map was drafted before it, in anticipation of it; the third state racing to redraw was Tennessee.
Redistricting in the other direction did not survive. Virginia voters approved a referendum that would have shifted the state’s delegation substantially toward Democrats; the Virginia Supreme Court struck it down 4-3 on May 8 on procedural grounds, because the legislature took its vote after early voting had begun.[19]
Missouri shows how unsettled the maps still are this fall. Its legislature drew a new congressional map in 2025, during the round of mid-decade redistricting that followed Trump’s push in Texas. Republicans hope it will help them win seven of the state’s eight House seats, and it significantly reshapes the Kansas City district held by Democratic Rep. Emanuel Cleaver. The August primaries used the new map. On September 3 the Missouri Supreme Court ruled it could not be used in November, because opponents had gathered enough signatures to put it to a statewide vote. On September 21 a federal appeals court ruled the other way, holding that a primary and a general election must use the same districts, and then paused its own order until September 28 so the Supreme Court could decide. On September 25 it did, for the third time: “In short, as a matter of state law, the 2022 map—not the 2025 map—must be used in the 2026 congressional election.” Missouri votes this November in its old districts, and the 2025 map goes to the voters as a referendum.[20][21]
The pattern is worth stating without exaggeration. Mid-decade redistricting is legal in most states and is not new. What is new is the volume and the speed: before 2025, only two states had conducted voluntary mid-decade redistricting since 1970. States that want to draw maps that disadvantage minority voters can now claim partisan rather than racial motivation, and courts cannot review either claim.
Six states enacted new congressional maps between the 2024 and 2026 elections. Before 2025, only two states had conducted voluntary mid-decade redistricting since 1970. The redistricting arms race is accelerating.
Congress could ban partisan gerrymandering through legislation. The Freedom to Vote Act would have created a statutory ban enforceable in federal court. It was filibustered.[15]
Voters have shown, repeatedly and across party lines, that they want fair maps. The question is whether the institutions that draw those maps will listen.
Sources
1. AP/PBS NewsHour: Analysis Shows Gerrymandering Benefited GOP in 2016 (June 2017)
2. Wikipedia: REDMAP (Redistricting Majority Project)
3. WBUR/Bill Moyers: How Republicans Weaponized Gerrymandering Through REDMAP
4. Brennan Center for Justice: Gerrymandering Explained
5. Wikipedia: Rucho v. Common Cause (2019)
6. CBS News: Wisconsin Supreme Court Strikes Down GOP-Drawn Legislative Maps (December 2023)
7. Brennan Center: Pennsylvania Supreme Court Confirms Congressional Map Is Illegal (2018)
8. Ohio Capital Journal: Ohio Gerrymandering, A Brief and Awful History (October 2024)
9. NPR: Deceased GOP Strategist’s Daughter Makes His Redistricting Files Public (January 2020)
10. Roll Call: When Does Partisan Gerrymandering Cross the Line? (March 2019)
11. NBC News: Maryland Judge Rules Congressional Map Unconstitutional (2022)
12. Library of Congress: Gerrymandering, The Origin Story
13. Washington Post: Illinois Democrats’ Gerrymandered Map (September 2021)
14. NPR: New York’s Congressional Redistricting Map Rejected by Court (April 2022)
15. Campaign Legal Center: What the Freedom to Vote Act Means for Partisan Gerrymandering
16. Slate: The Supreme Court’s Conservatives Just Issued the Worst Ruling in a Century (April 2026)
17. Common Dreams: Louisiana Governor Suspends Elections (May 1, 2026) and KATC: Court denies emergency request to continue Louisiana congressional primary election and PBS NewsHour: Louisiana congressional primaries suspended after Supreme Court ruling, state officials say
18. Democracy Docket: Voters sue to block Florida’s new map (May 4, 2026) and Bloomberg Law: Florida sued over new GOP-favoring congressional map
19. Democracy Docket: Alabama prepares to eliminate majority-Black districts while moving forward with elections it may annul (May 4, 2026) and The Guardian: Supreme Court used misleading data in Voting Rights Act ruling (May 8, 2026)
20. Associated Press via KPRC: Appeals court favors Trump-backed Missouri congressional map, but Supreme Court will have final say (September 21, 2026), U.S. Court of Appeals for the Eighth Circuit: Opinion, Onder v. Missouri, No. 26-2797 (September 21, 2026) and NBC News: Missouri Supreme Court rules new GOP-drawn map can’t be used for November elections (September 3, 2026)
21. Supreme Court of the United States: People Not Politicians v. Onder, No. 26A388, per curiam (September 25, 2026) and AP: Supreme Court rejects a Trump-backed Missouri congressional map for the third time (September 25, 2026)
23. Florida Politics: Ron DeSantis signs Florida’s new congressional map (May 4, 2026) and Florida Politics: Florida Supreme Court rules new congressional map can stand for 2026 Midterms (June 10, 2026)
24. Office of the Governor of Alabama: Governor Ivey Celebrates Major Court Victory in State’s Redistricting Battle, Calls Special Election for Alabama-Drawn Congressional Map (May 12, 2026) and AP via OPB: Democratic incumbents win US House primaries in Alabama districts redrawn after Supreme Court ruling (August 11, 2026)