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Democrats appear poised to retake control of the House on Tuesday. If they do, will their majority be built upon a blue wave or a tiny trickle? A previous NPR analysis found both parties spending deep and wide in a competitive landscape that spans 70 districts, ranging from longtime tossups to newly-competitive seats in deeply conservative areas.
Republicans came into Election Day with a narrow 218-214 seat advantage in the House and facing severe headwinds as the party in power. This midterm cycle has also seen a record number of departures from Congress, and polls show voters aren't happy about things like the economy and the ongoing war in Iran.
So what separates a good night for Democrats from a blue wave that sees dozens of House seats change hands? Here's NPR's cheat sheet to four types of House races to watch as results come in:
Early polls closing
The first results of the night with national implications will likely be from Kentucky's 5th Congressional District (KY-06) and Indiana's 5th (IN-5), two districts where polls close first (in the 6 p.m. ET hour) and whose 2024 margins for President Trump (15 and 17 points, respectively) could act as a preview for how much voters have soured on Republicans.
Democrats and Republicans alike have spent heavily in the Kentucky race, where Democrat Zach Dembo faces Republican Ralph Alvarado, so the increased investment is worth noting as a factor on the outcome. If Democrats flip one or both of these races, then it will likely be a long night for the GOP.
Florida also counts and reports its votes quickly, and is home to more than a half dozen races that are viewed as toss-ups or slightly favor one party or the other, so as these districts have projected winners there will be more insight into other races across the country.
Like the Kentucky contest, both parties have spent significant sums in races like the open seat in FL-22 with Democrat Pia Dandiya facing off against Republican Casey Askar and incumbent Democratic Rep. Jared Moskowitz versus Republican Scott Singer in the newly-redrawn FL-25 race.
Other races to watch: FL-27, NC-11, SC-01, VA-01
Last-minute big spending
In the final seven days of the midterms, a handful of House races have seen more than $10 million in ad spending, according to data from AdImpact. It's a sign of where both parties think the saying "It all comes down to turnout!" is more than a cliche. That includes districts in Michigan, such as MI-07, where progressive Democrat William Lawrence is challenging incumbent Republican Tom Barrett in a seat that Trump carried by just over one percent in 2024 and the open MI-10, where Democrat Christina Hines faces Republican Mike Bouchard.
New York Republican Rep. Mike Lawler in NY-17 could be one of the rare Republicans who holds on to his seat thanks in part to his party's ad spending advantage in the closing stretch against Democrat Cait Conley.
Three of Iowa's four House races, IA-01, IA-02 and IA-03 are on the list of most expensive, in part because of the competitive governor and U.S. Senate races that are also on the ballot and driving up turnout.
Other races to watch: CO-08, PA-01, WA-03, WI-03
Redistricting
This year's Supreme Court decision rolling back part of the Voting Rights Act led to many Republican-led states redrawing their House maps to eliminate districts that favor Democrats in a typical election year – but this year is not typical.
Now, the political environment has deteriorated so much that seats like AL-02, held by Democrat Shomari Figures, OH-09 held by Democrat Marcy Kaptur and NC-01 held by Democrat Don Davis are all considered toss-ups at best and favoring the Democrats at worst for Republicans.
In Texas, Latino voters seem poised to swing back to Democratic candidates and could prevent Republican Eric Flores from flipping the seat held by Rep. Vicente Gonzalez in TX-34 or Tano Tijerina from unseating Democratic incumbent Henry Cuellar in TX-28.
Other races to watch: CA-22, FL-09, FL-14, TX-35
The outer edges of the map
As results continue to be reported, one thing to watch is how far into conservative communities the increased support for Democrats can go.
One race that has received a surprising amount of ad attention is in Arkansas's 2nd district (AR-02), where incumbent Republican Rep. French Hill faces a well-known challenger in Democrat Chris Jones. By the time polls close, closer to $10 million will have been spent in the final months on the Little Rock-based seat that Trump carried by 15 points in 2024.
There are also many districts in states that redrew their maps where the Republican gerrymander could backfire, like Ohio. In both OH-10 held by Republican Mike Turner and OH-15 held by Republican Mike Carey, Trump won by closer to 10 points in 2024. They're also in a state with competitive governor and Senate races and stretch between the suburbs and exurbs of Dayton and Columbus with an electorate that could swing away from the GOP.
The margin in North Carolina's Senate race, where former Gov. Roy Cooper is expected to win against former Republican National Committee Chair Michael Whatley, could determine if races like NC-03 are in play as well too. Rep. Greg Murphy's district absorbed more Democratic-leaning voters after the latest map redraw.
Other races to watch: NC-09, NY-21 TN-09, WA-05
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