Mid-Decade Redistricting Explained, From Tom DeLay's 2003 Texas Map to Today

In May 2003, chartered buses left Austin carrying Democratic members of the Texas House of Representatives, and soon more than fifty of them had checked into a Holiday Inn in Ardmore, Oklahoma, just across the Red River. They had not come for the scenery. Under Texas rules the House could not do business without two-thirds of its members present, and by leaving the state the Democrats put themselves beyond the reach of state troopers sent to bring them back. The bill they were running from was a new congressional map, drawn only two years after the last one, and its chief sponsor was not a Texas legislator at all. He was the majority leader of the United States House, a former pest-control businessman from Sugar Land named Tom DeLay. Before the summer was over, a federal agency would be asked to help find a missing airplane, a second group of legislators would decamp to New Mexico, and the country would have its first modern test of a question that had barely been asked: once a state has redrawn its map after a census, can it simply do it again?

In short: Mid-decade redistricting means redrawing congressional districts between censuses, usually because a new majority wants a better map. Texas did it in 2003 under pressure from Tom DeLay, and in LULAC v. Perry (2006) the Supreme Court declined to forbid it while striking one district under the Voting Rights Act. That ruling is why Texas, Missouri, North Carolina and California could redraw in 2025, and why only state law or Congress can stop it.

The map that was supposed to last a decade

After the 2000 census, Texas gained two seats in the House. The legislature, then split between a Republican Senate and a Democratic House, could not agree on new lines, so a federal court drew them in 2001. That court-drawn map left many conservative-leaning districts in the hands of long-serving Democratic incumbents, white rural Democrats who kept winning in places that voted Republican for president. The delegation that took office in 2003 was 17 Democrats and 15 Republicans.

Then the 2002 elections gave Republicans control of the Texas House for the first time since Reconstruction. Republicans now held both chambers and the governor's office, Rick Perry. DeLay, who had helped raise money for the 2002 legislative campaigns through a political committee called Texans for a Republican Majority, saw an opening. With full control in Austin, the party could replace the court's map with one of its own and convert the Democratic seats in Republican territory.

The argument for doing it was not hidden. Republicans said the court map did not reflect how Texans actually voted, and that the legislature, not judges, was supposed to draw districts. The argument against was that the map had been drawn for the decade, and a state that redraws whenever its majority changes turns the census into a formality.

Ardmore, Albuquerque and the missing airplane

The Ardmore walkout worked for a while. The Democrats, nicknamed the Killer D's, stayed away until the deadline for the regular session passed and the redistricting bill died. Governor Perry then called a special session. This time the House had the votes, and the resistance moved to the Texas Senate, where Democrats could block bills under a tradition that required two-thirds agreement to bring legislation to the floor. When the lieutenant governor signalled he would set that tradition aside, eleven Democratic senators flew to Albuquerque, New Mexico, and stayed for weeks.

The strangest episode came during the first walkout. State officials searching for the absent Democrats sought help tracking a plane belonging to a former Democratic Speaker of the Texas House, Pete Laney, and a request ended up at a federal office that was part of the new Department of Homeland Security. Federal resources had been pulled into a state partisan dispute over a map. The episode led to investigations, and in 2004 the House ethics committee admonished DeLay over contacts with federal aviation officials during the hunt, along with other matters.

The Senate walkout ended when one Democrat, John Whitmire of Houston, returned to Austin, restoring a quorum. In a third special session that fall, the legislature passed the new map. In the 2004 elections, Texas sent 21 Republicans and 11 Democrats to Congress. Several longtime Democrats lost or retired, one switched parties, and the House majority DeLay led grew.

It is worth noticing that the same political machinery had a second life in court. The corporate money raised through DeLay's committee for the 2002 legislative races became the subject of a criminal case in Texas. He was convicted of money laundering in 2010, and an appeals court later overturned the conviction, a ruling the state's highest criminal court upheld. The map outlived the prosecution by a wide margin.

What LULAC v. Perry decided, and what it did not

Challengers went to federal court with several arguments. The most sweeping was that redrawing a lawful map in the middle of the decade, for no reason except partisan advantage, violated the Constitution. A second was that the map diluted the votes of Latino Texans in violation of Section 2 of the Voting Rights Act.

The Supreme Court decided the case, League of United Latin American Citizens v. Perry, in June 2006. The justices split into a thicket of separate opinions, and the controlling one was written by Justice Anthony Kennedy. On the big question, the Court said no. Nothing in the Constitution limits a state to one redistricting per census, Kennedy wrote in substance; legislatures may replace a court-drawn plan with their own, and the fact that a new majority was motivated by party did not, by itself, make the plan unlawful. The Court had been unable for years to agree on any test for when partisan gerrymandering goes too far, and it did not find one here.

On the narrower question, the challengers won. The 2003 map had redrawn District 23, a sprawling West Texas seat that ran along the border, to protect a Republican incumbent, Henry Bonilla, whom Latino voters had been increasingly voting against. The new lines moved about 100,000 Latino residents out of the district, and the Court held that this violated Section 2: the state had taken away an emerging Latino opportunity to elect a candidate of choice just as it was about to be used. A new compensating district elsewhere, stretching from Austin to the border, did not cure the problem, because it joined Latino communities hundreds of miles apart with different needs. District 23 had to be redrawn.

So LULAC v. Perry left two lessons. One was permissive: mid-decade redistricting for partisan reasons is not, on its own, a federal constitutional violation. The other was a limit: the Voting Rights Act still applied, whenever the map was drawn. Thirteen years later, in Rucho v. Common Cause, the Court went further and held that federal courts could not hear partisan gerrymandering claims at all. Between the two decisions, the only federal guardrail left on a mid-decade partisan redraw was race.

Why most states did not follow, until recently

If mid-decade redistricting was legal, why did it stay rare for two decades? Partly because state law got in the way. In 2003 Colorado's legislature also redrew its congressional map mid-decade, and the Colorado Supreme Court struck the new map down because the state constitution allowed congressional redistricting only once after each census. Several other states have similar language, and some put redistricting in commission hands entirely.

Partly, too, it was custom. Legislators knew that a party which redraws when it wins invites the other party to redraw when it wins, and the costs of perpetual map-making fall on members of both parties who prefer to know their districts. Ohio, for one, adopted constitutional reforms after 2010 that set rules for when and how maps are made. Habits like these are not law, but they did a lot of quiet work.

What broke the habit was pressure from the top. In 2025, President Trump publicly urged Republican legislatures to redraw before the 2026 midterms, starting with Texas. Texas Democrats again broke quorum, this time decamping mostly to Illinois; the map passed after they returned. Missouri and North Carolina followed. California answered with Proposition 50, a voter-approved temporary map. Each of these moves rested on the permission LULAC v. Perry gave in 2006.

How a mid-decade redraw actually moves seats

It helps to see the mechanics, because the 2003 map and the 2025 maps worked the same way.

A mapmaker starts with a list of the opposing party's incumbents and asks, district by district, which ones survive only because of where the lines fall. In Texas in 2003 the targets were mostly white Democrats representing rural and small-city districts that had voted Republican for president for years. The new map pulled those members' home counties into districts dominated by suburban Republican voters, or paired two Democratic incumbents in one seat, or attached a rural base to a distant city where the member was unknown. A few Democrats lost; others saw the numbers and retired. One of them changed parties.

At the same time, the map kept or created districts where Black and Latino voters could elect candidates of their choice, because the Voting Rights Act required it. The result was a delegation that was more Republican and more racially polarized: the white Democrats who had once bridged rural conservative voters and the national party were mostly gone, and the Democrats who remained represented heavily minority urban districts. Some scholars of Texas politics have argued that this sorting, repeated across the South in that era, hardened the racial divide between the parties in ways that still shape Southern elections.

The 2025 redraws used the same tools with better data. Software now lets a mapmaker test thousands of variations in an afternoon, using precinct-level results from recent elections. The question is no longer whether a partisan map can be drawn, but how far the mapmaker is willing to push before the map becomes fragile, with districts so narrowly tilted that a bad year for the party could flip several at once. A gerrymander built to win the most seats is also a gerrymander that can collapse in a wave.

The strongest defence of redrawing, and the answer

It is fair to ask whether there is a principled case for mid-decade maps. There is one, and it goes like this. The Constitution gives legislatures the job of drawing districts. A legislature elected in 2022 or 2024 has as much democratic authority as one elected in 2020. If a court drew the existing map, as in Texas in 2001, the legislature reclaiming its role restores accountability. And if the people dislike the result, they can vote the legislators out.

That argument has force when the existing map came from a court or a deadlock. It has much less when the existing map was already drawn by the same party, as in Texas in 2025, and the only thing that changed was the national political calendar. The "vote them out" answer also runs into the very problem gerrymandering creates: the map shapes which legislators can be voted out. A majority that can redraw whenever it likes is a majority that can insulate itself from the electorate it is supposed to answer to.

A fair reading of the record is that both parties have used mapmaking power when they had it. Democrats in Maryland and Illinois drew aggressive maps after 2010 and 2020. The difference with mid-decade redistricting is timing: it turns the map into a tool to be reached for in any season rather than a once-a-decade exercise, and that is a change worth resisting no matter who starts it.

What would actually end it

Three routes exist. State constitutions can do it, as Colorado's did: a clause allowing only one redistricting per census closes the door, and voters in several states have added such limits through commissions or amendments. State courts can enforce those clauses. And Congress can do it nationally, because the Constitution's Elections Clause lets Congress "make or alter" the rules for congressional elections. Congress used that power in 1842 to require single-member districts and in 1967 to require them again. It could set a once-per-census rule tomorrow, if it had the votes and a president willing to sign.

That last part is the honest catch. Bills to ban mid-decade redistricting and require independent commissions have been introduced before and have stalled in the Senate. With Democrats having won the House and the Senate in November 2026, the question will come back in the new Congress, which is sworn in on January 3, 2027. A bill that applies to every state, including Democratic ones, would be the credible version, and it would ask Democrats in Illinois and Maryland to give up something too. Reform that only binds the other side is not reform.

What you can do

• Check your state's rules. Does your constitution limit redistricting to once per decade? If not, that is a ballot-measure campaign waiting to happen. The voting rights and redistricting topic page follows those fights state by state.
• Call your members of Congress. Ask whether they will co-sponsor a national ban on mid-decade partisan redistricting that applies to every state. Find your representatives gives you the phone numbers and contact forms.
• Watch what Congress does with it. The Congress votes and bills page shows what is moving and how members voted, so you can see whether promises turn into roll calls.
• Back the people who draw community maps. Local voting rights groups train volunteers to document neighbourhoods and testify. The organizations directory lists them by state.