In our recent coverage of the Welcome Democracy Institute’s Congressional Competition Index (CCI), we highlighted the importance of parties contesting a broader map. Since then, Democrats have seen their lead in the generic ballot grow to roughly 8 points, a double digit swing from the 2024 electorate. That swing has led race raters like Cook Political Report and Sabato’s Crystal Ball to shift a number of seats towards Democrats, continuing a trend that has been growing this cycle.
The lesson for parties should be straightforward: contest a big map early, because you never know what will happen between the beginning of the cycle and Election Day.
How It Looked When The Map Was Set
The fact that Democrats are poised for big House gains seems likely today, and in retrospect, many signs were there earlier on in the cycle. But it’s important to remember how different the environment was when candidates were deciding whether to run or not.
The Iran War started on February 28th, just days before the March 3rd Texas primary. By then, candidate filing deadlines had already passed in 15 states, with another 15 states set to close their filing periods within four weeks. At that point, the generic ballot was D+4, a favorable environment, but not one that suggested a decisive shift in the House. Control of the chamber still looked likely to come down to a relatively small number of seats.
But even that understates how early the map was really set. Candidates typically do not decide to run when the filing deadline arrives. To build a credible campaign, candidates would have needed to begin organizing, fundraising and announcing in early to mid 2025, when the generic ballot was D+2. Even before that, candidates were likely considering a run in the immediate aftermath of the 2024 elections, when Republicans briefly held the advantage.
That is why the CCI argues that parties should build credible campaigns well beyond the handful of districts initially identified as toss-ups or lean.
The Race Raters
Race ratings are useful snapshots of the political environment at any given moment. However elections are fluid, and as this cycle has shown, environments can change in a short amount of time.
Of the 15 Republican-held seats that Cook rates as Toss Ups (that were not significantly altered by redistricting1), only six were Toss Ups at the start of the cycle. Another six began as Lean Republican, one began as Likely Republican (Texas 15) and two made their way all across the board from Solid Republican (North Carolina 11 and Ohio 7).
That means a majority of today’s Republican-held Toss Ups were not considered Toss Ups when campaigns were taking shape. And three of them were initially rated Likely or Solid Republican, exactly the kind of seats that could easily have been overlooked by a party focused only on the conventional battlefield.
Two of those three are Welcome races: NC-11 and TX-15. Both illustrate the value of having credible candidates like Jamie Ager in North Carolina and Bobby Pulido in Texas, who are running as locally focused, aggressively centrist campaigns in districts that Trump won by double digits less than two years ago.
The point is not that the earlier ratings were wrong. Things can change that impact races over time: the national environment moves, strong candidates emerge, incumbents face scandals, etc. The lesson here is that initial ratings should help describe the battlefield, not define its outer limits. Competing in a broader set of districts creates the infrastructure to capitalize when a race that once looked unlikely suddenly becomes competitive.
What It Means
American politics has been incredibly volatile for the last decade. Consider House control. After nearly a half-century of Democratic control of the House, Republicans took the chamber in 1994 in a wave election, and held it until 2006. Democrats then controlled the chamber in a wave election for four years, before losing it in yet another wave election in 2010. Republicans then held the chamber for four terms, before losing it in, you guessed it, the 2018 wave election. Democrats then held the House for two terms before losing it again in 2022. Republicans retained their narrow majority in 2024, and the chamber is once again highly competitive in 2026.
House control went from changing every half century to changing every decade to changing nearly every election!
In this environment, parties must contest a broad map, because it’s difficult to ascertain two years out what might be competitive. Voters are poised to “throw the bums out,” and incumbents may end up emerging weaker than expected. When Jamie Ager ran for a North Carolina seat that was seen as “safe Republican,” no one predicted the incumbent, Chuck Edwards, would be forced to retire due to sexual misconduct allegations.
That uncertainty is precisely the point. Parties cannot predict which supposedly safe seats will become competitive. They can, however, make sure they have candidates in place when they do.
Texas 15 lines were changed but the presidential margin between the old and new district remained the same