These House races could determine which party is in control in the next Congress

ABC News rates 16 House races as Tossups because their outcomes could decide control of the House. The provided text names 11 before ending during the Ohio 7 description: Florida 14 and 22, Iowa 2, Kentucky 6, Michigan 4, 7, and 10, Montana 1, North Carolina 1, New York 17, and Ohio 7. The remaining five are not included in the supplied text.

Several races lack an incumbent. Retirements by Ashley Hinson, Andy Barr, John James, and Ryan Zinke opened seats. Redistricting made Florida 14 and North Carolina 1 more competitive. Rematches also matter, especially Don Davis against Laurie Buckhout. Candidate strength, presidential endorsements, and local issues add uncertainty.

The districts do not all share the same political pattern. Trump carried Iowa 2, Michigan 10, Montana 1, and others, while Kamala Harris won New York 17. Incumbents such as Mike Lawler and Bill Huizenga are still vulnerable because national conditions and changing district dynamics can overcome party leanings.

Democrats must gain at least three House seats net to take control, according to the article. A net gain means Democratic victories exceed Democratic losses by three seats. The change matters because House control depends on which party holds more seats, not on the size of the national popular vote.

Three seats is a very small share of the 435-seat chamber. Dividing three by 435 gives about 0.69%, so the required shift is under 1% of all House seats. The article links this narrow margin to 16 Tossup races whose results could determine the balance of power.

That makes each competitive district disproportionately important. A few open seats, rematches, or vulnerable incumbents could produce the needed net gain. The winners of those races will help determine the party balance for the 120th Congress, although the article does not provide a complete forecast.

A party controls the House when it holds more seats than the opposing party after elections. The article describes this as determining the “balance of power” for the 120th Congress. The party with the majority can usually choose the Speaker and organize the chamber’s committees.

Control affects what reaches the floor. The majority party generally sets the legislative schedule, decides which bills receive hearings, and controls committee leadership. It can advance priorities more easily, while the minority party has fewer procedural opportunities. Members still need votes, so control does not guarantee passage of every proposal.

House control also shapes oversight. Majority-led committees can decide which agencies, officials, or controversies receive attention. The supplied article does not explain these institutional powers, but it presents the competitive races as important because their results will determine which party holds that authority in the next Congress.

When House control switches, the new majority usually reorganizes the chamber. It selects the Speaker, assigns committee chairs, and sets the legislative schedule. Those choices determine which proposals receive hearings, move through committees, and reach the House floor. The minority can still offer amendments and oppose bills, but it has less control over timing and priorities.

Investigations can change even faster. Majority-led committees decide which subjects to examine, request documents, call witnesses, and issue reports. A new majority may end some inquiries, open others, or focus on different executive actions. Subpoena and oversight activity can therefore shift with the election results.

The supplied article does not describe specific legislation or investigations. It only says the Tossup races could determine the House’s balance of power. In practice, that balance affects the next Congress’s policy agenda and oversight priorities, especially when the margin is narrow.

Incumbents usually bring name recognition, fundraising networks, and a record of serving constituents. When they retire, an open seat begins without those advantages. That can make a district competitive, even when one party normally dominates it. The article identifies open races created by departures or higher-office campaigns in Iowa, Kentucky, Michigan, and Montana.

Redistricting can change a district’s partisan makeup and place an incumbent among less familiar voters. Florida’s legislature redrew Florida 14, putting Kathy Castor on the defensive. North Carolina’s redrawn 1st District became a top Republican target. A rematch also keeps a known contest alive, as Don Davis faces Laurie Buckhout again.

These changes alter both the candidates and the electorate. They can create openings for stronger challengers, reduce an incumbent’s advantage, or make local issues more important. The article therefore treats open seats, redrawn boundaries, and rematches as central reasons these races may come down to the wire.

Presidential and House elections measure different choices. Voters may support one party’s presidential nominee while choosing a different party’s congressional candidate. District-level concerns, candidate reputation, incumbency, campaign organization, and local issues can all produce that split result.

The article gives Mike Lawler as a clear example. He is one of two Republicans seeking reelection in districts Kamala Harris won. Lawler has held New York 17 since 2022 and outperformed Donald Trump there by 2.8% in 2024. His work securing State and Local Tax deductions during tax negotiations may also help him appeal locally.

A presidential win therefore does not guarantee a House win for the same party. The article also notes that Bill Huizenga outperformed Trump in 2024, while several other Tossup districts were carried by Trump. These results show why House races must be judged district by district.

The House is divided into congressional districts, and each district elects one representative. All 435 seats are contested in the election described by the article. After voters choose among the candidates in each district, the seats are counted by party. The party with more representatives holds the House majority.

This is a seat-by-seat system, not a nationwide vote. A candidate wins a district by receiving the most votes there, while the other candidates do not receive that seat. A party can therefore win House control through victories in enough districts, even if its national vote margin is small or unevenly distributed.

The article says Democrats need a net gain of at least three seats to take control. That illustrates the mechanism: the party must win at least three more districts than it loses. The resulting seat count determines the balance of power for the 120th Congress.