Midterm math: How both parties are trying to break the historical seat-loss cycle

The midterm election pattern is one of the most consistent forces in American politics. Historically, the party holding the presidency almost always loses seats in the House and often in the Senate during the election held halfway through a term. Today, as voters head to the polls to decide who controls Congress for the final two years of President Donald Trump's second term, both parties are deploying specific strategies to disrupt this long-standing trend. The Associated Press describes the day as a referendum on the administration's performance, with voters weighing high prices and an unpopular war with Iran against the desire for continuity or change.

Republicans, who currently hold a 53 to 47 majority in the Senate and a narrow lead in the House, are bracing for a potential loss of the lower chamber. Their strategy to beat the midterm pattern relies heavily on redistricting. Following mid-decade redistricting, six states, including Florida, Texas, and North Carolina, are using new congressional maps. The Republican National Committee argues these maps lock in favorable districts. Chairman Joe Gruters stated that everything depends on turnout, claiming that if they turn out their voters, they win. The party is also leveraging significant financial resources, with committees outraising Democrats thanks to Trump-affiliated groups and Elon Musk.

Democrats, who need a net gain of three House seats and four Senate seats to take control, are taking a different approach to overcome the historical headwind. They are focusing on the economic strain felt by voters and the unpopularity of the current administration's policies. DCCC Chair Rep. Suzan DelBene noted that the American people are angry and want change. The Democratic campaign strategy emphasizes local issues and high turnout among moderate voters who may have supported the president in 2024. They are also targeting the 21 Democratic-held districts that voted for Trump in 2024, hoping to convert those voters back to the Democratic column in down-ballot races.

The Senate race presents a unique challenge for both parties. Republicans hold 20 of the 33 regular seats up for election, while Democrats hold 13. However, the Democrats need to win a net gain of four seats to secure a majority. This requires them to hold their vulnerable seats in states like Georgia and Maine while flipping Republican-held seats in places like Michigan and New Hampshire. The Associated Press reports that one or two seats could tip the balance in either chamber. In Maine, the race between Sen. Susan Collins and Democratic former state Senate President Troy Jackson is considered a toss-up, with economic strain and tariffs making the state competitive. Republicans hope to hold these swing states to maintain their majority.

Financial spending has been a key tool for both parties in an attempt to influence the outcome. The 2026 elections are expected to be the most expensive in history. An analysis of AdImpact data by the Associated Press shows that 88.1% of Republican general election TV ad spending went to states and districts Trump won in 2024. This includes more than $850 million spent in areas where he won by 10 points or more. Conversely, at the candidate level, Democrats have outraised their opponents. This disparity highlights the different financial strengths of the two parties and their varying approaches to allocating resources in battleground districts and states.

President Trump has been actively involved in the campaign, holding dozens of rallies across the country. His final rally before the election was held in Salina, Kansas, where he urged voters to pretend he is on the ballot. This strategy aims to boost Republican candidates in the House and Senate by linking their fate to the president's popularity. However, many Republican candidates have kept some distance from the president, particularly in competitive districts. The president has also continued to make claims about voting fraud, including that noncitizens vote in large numbers. His administration has sued in Alaska and California, and Democrats fear interference and intimidation as the Justice Department threatens to prosecute local election officials.

The governor's races are also a critical component of the midterm fight. Democrats hope to hold a majority of governorships for the first time in two decades. They are defending five governorships in states Trump won in 2024, including Arizona, Kansas, Michigan, Pennsylvania, and Wisconsin. Republicans are defending two governorships in states Harris won, New Hampshire and Vermont. The Associated Press calls Texas, Florida, and Iowa competitive governor races. The outcome of these races will determine which party controls the statehouses, which can influence future redistricting and policy agendas at the state level.

Voter turnout is the ultimate variable that both parties are trying to manage. More than 57 million people had already voted as of Monday, surpassing the early vote of four years ago in many closely watched states. The U.S. Postal Service has added hours, staff, and special lines to ensure mail ballots are counted on time. A federal judge temporarily barred the Trump administration from carrying out a plan to prevent noncitizen voting, which critics say risks disenfranchising eligible voters. This legal battle highlights the high stakes of the election and the efforts by both sides to ensure their preferred outcome is achieved through procedural and legal means.

The impact of the election extends beyond Congress. Wall Street is watching for more than just control of the legislative branch. Reuters reports that results could add to investor concerns about AI spending and debt ceiling negotiations. If Democrats win even one chamber, investigations and possible impeachment proceedings become likely. House Democratic Leader Hakeem Jeffries would be the first Black speaker and has outlined a 100-day agenda on the cost of living and oversight. A strong Democratic night would also boost potential 2028 candidates like Gavin Newsom, JB Pritzker, and Pete Buttigieg, while potentially complicating Vice President JD Vance's path. Republicans, on the other hand, are focused on maintaining their legislative foothold to advance their agenda and protect the president's legacy.