Four House races will show how strong the Democratic takeover is

Democrats are on track to retake the House of Representatives on Tuesday.

The central question for observers is not just who controls the chamber, but how they got there. A previous analysis by NPR indicated that both parties are spending heavily across 70 competitive districts. This range includes long-standing tossups and newly competitive seats in areas that have historically voted conservative.

Republicans entered Election Day with a slim 218 to 214 seat advantage. They face a difficult environment as the party in power. This cycle also features a record number of congressional departures. Polls suggest voters are unhappy with the economy and the ongoing conflict in Iran.

The first results with national implications will likely come from Kentucky and Indiana. Polls close at 6 p.m. ET in Kentucky's 5th Congressional District and Indiana's 5th. Donald Trump won these districts by 15 and 17 points, respectively, in 2024. These margins serve as a preview of how much voters have turned against Republicans.

Both parties have invested heavily in the Kentucky race between Democrat Zach Dembo and Republican Ralph Alvarado. If Democrats flip one or both of these early reporting districts, it will signal a long night for the GOP. Florida also reports votes quickly. The state has more than six races viewed as tossups or slight favorites. Notable contests include the open seat in Florida's 22nd District, where Democrat Pia Dandiya faces Republican Casey Askar. Florida's 25th District, where incumbent Democrat Jared Moskowitz faces Republican Scott Singer, is also being watched closely.

A sign of where parties believe turnout is decisive can be found in ad spending. In the final seven days of the midterms, several House races saw more than $10 million in advertising, according to AdImpact data. Michigan's 7th District is one such race. Progressive Democrat William Lawrence challenges incumbent Republican Tom Barrett in a seat Trump carried by just over one percent in 2024. In Michigan's 10th District, Democrat Christina Hines faces Republican Mike Bouchard.

New York Republican Representative Mike Lawler may hold his seat in the 17th District due to a party ad spending advantage against Democrat Cait Conley. Iowa's first, second, and third districts also rank among the most expensive races. This spending is partly driven by competitive governor and Senate races on the ballot that are driving higher voter turnout.

This year's Supreme Court decision rolled back part of the Voting Rights Act. This change led many Republican-led states to redraw House maps to eliminate districts that favor Democrats. The political environment has since deteriorated. Seats like Alabama's 2nd District, held by Democrat Shomari Figures, and Ohio's 9th District, held by Democrat Marcy Kaptur, are now considered tossups or leaning Democratic.

In Texas, Latino voters appear ready to swing back to Democratic candidates. This trend could prevent Republican Eric Flores from flipping the seat held by Representative Vicente Gonzalez in the 34th District. It could also stop Tano Tijerina from unseating Democratic incumbent Henry Cuellar in the 28th District.

The reach of Democratic support into conservative communities is another key metric. Arkansas's 2nd District has received significant ad attention. Incumbent Republican Representative French Hill faces Democrat Chris Jones in a Little Rock-based seat that Trump won by 15 points in 2024. Close to $10 million will have been spent in the final months of this race. In Ohio, redistricting may backfire on Republicans. Mike Turner in the 10th District and Mike Carey in the 15th District face districts that stretch between the suburbs and exurbs of Dayton and Columbus. The margin in the North Carolina Senate race, where former Governor Roy Cooper is expected to win, could also determine if races like the 3rd District are in play.