Why it could take a while to know who will control Congress

A party controls Congress by winning enough seats to hold a majority in the House of Representatives or the Senate. Full congressional control means having the majority in both chambers. This matters because the election determines which party can set the legislative agenda and organize each chamber.

The House requires a party to reach 218 seats when all 435 seats are filled. The Senate has a different threshold: Democrats need 51 seats, while Republicans can control it with 50 because the vice president can break a tie.

The article describes a close contest for control. Republicans currently have 219 House members, just one above the majority threshold, and hold a 53-47 Senate edge. Because several races may remain undecided after Election Day, the AP may need days to determine which party controls each chamber.

The House has 435 districts, so a party needs 218 seats to control it when every seat is filled. That is one more than half the chamber. The threshold matters because even a one-seat difference can decide which party organizes the House.

The Senate uses different effective thresholds. Democrats need 51 seats, but Republicans need only 50 because Vice President JD Vance can cast a tie-breaking vote for his party. This gives a 50-seat Republican majority the same practical control as 51 seats.

The current numbers show why the election is competitive. Republicans have 219 members caucusing with them in the House, although two seats are vacant. In the Senate, Republicans currently hold 53 seats to Democrats’ 47, but 35 Senate contests are being elected this year.

It can take days to know who controls Congress because races may be extremely close and states count ballots on different schedules. The AP calls all 435 House races and 35 Senate contests, but it declares a winner only when trailing candidates no longer have a possible path to victory.

California is one major example. The state has received thousands of mail ballots on Election Day, and half its votes were counted after Election Day in 2022. Alaska and Maine use ranked-choice voting, which can require additional counting and vote transfers when nobody reaches a majority initially.

Recent elections show the possible delay. In 2022, the Senate control call came four days after Election Day, while the House call came eight days later. In 2024, the Senate was called the next day, but the House still took eight days. Timing will depend on this year’s margins and counting processes.

Mail ballots counted after Election Day can change the running totals in a close election. A candidate who leads early may not remain ahead once later ballots are included. That makes control of a congressional seat, and potentially an entire chamber, uncertain for longer.

California illustrates the timing problem. It has seen thousands of mail ballots dropped off on Election Day, and half of the state’s votes were counted after Election Day in 2022. Those ballots are added to the same race totals, so their results can affect whether the leader has an insurmountable advantage.

The AP waits before calling a race. It declares a winner only when no scenario would allow trailing candidates to close the gap. If late-counted ballots keep the contest close, the AP must wait, and unresolved House or Senate races can delay the overall decision about congressional control.

In ranked-choice voting, voters rank candidates rather than choosing only one. A candidate wins immediately if more than 50% of votes go to that candidate in the first round. If nobody reaches that mark, counting continues through additional rounds.

The candidate with the fewest first-choice votes is eliminated. Election officials then redistribute that candidate’s ballots according to each voter’s second choice. The process repeats as candidates are eliminated and votes move until a candidate reaches the required majority.

Alaska and Maine use ranked-choice voting, and both have key Senate races this year. Because the extra rounds require more counting and redistribution, results can take longer. The AP says this process can significantly delay results, adding another possible reason congressional control may remain unknown after Election Day.

The Senate’s control rule is different for the two parties because the vice president presides over the chamber and can break a tie. Therefore, a Republican party holding 50 Senate seats can prevail when Vice President JD Vance casts the deciding vote for Republicans.

Democrats cannot rely on that tie-breaking vote in the situation described. They need 51 seats to have a majority without depending on the vice president. The difference is one seat, but it changes the number each party must win.

Republicans currently have a 53-47 Senate advantage, according to the article. The election includes 35 Senate contests, so the balance could change. The final threshold remains 51 seats for Democrats or 50 for Republicans, assuming the vice president can provide the Republican tie-breaking vote.

The article focuses on how many seats determine control, not on the majority’s powers. Generally, the majority party organizes each chamber, chooses its leaders, and controls which bills receive hearings and floor votes. That makes it easier to advance its priorities.

A majority also shapes budgets by controlling the committees that write spending bills and by negotiating or blocking funding measures. Through hearings and subpoenas, congressional committees can investigate agencies, programs, and alleged misconduct. Committees can request documents and question executive-branch officials.

These powers make the election consequential beyond the final seat count. A majority can support or resist the president’s agenda, influence government funding, and increase oversight of executive agencies. The article’s central uncertainty is timing: the AP will not declare control until remaining races cannot mathematically change which party reaches the required threshold.