What Are Midterm Elections?

Midterm elections occur halfway through a president’s four‑year term, typically on the first Tuesday after the first Monday in November of even‑numbered years that are not presidential election years. They are a central feature of the United States’ federal system, offering voters a regular opportunity to reshape the balance of power in Congress, state capitols, and local governments. While presidential elections draw the highest public attention and turnout, midterms are equally consequential: they determine which party controls the House of Representatives and which party holds the majority in the Senate, and they set the stage for the final two years of a presidential term.

Historically, midterm elections have often served as a referendum on the sitting president’s performance. Since the end of World War II, the president’s party has lost House seats in all but two midterms (1998 and 2002). This pattern, sometimes called the “midterm penalty,” reflects voter dissatisfaction, lower turnout among the president’s supporters, or a desire for checks and balances. Understanding what happens during midterms—from voter behavior to the mechanics of congressional elections—is essential for grasping how the U.S. government shifts direction between presidential cycles.

Voter Participation and Turnout Dynamics

In presidential elections, voter turnout often exceeds 60% of the eligible voting‑age population. In midterms, that number historically falls to around 40–50%. For example, turnout in the 2022 midterm elections was about 46.8% of eligible voters, compared to over 66% in the 2020 presidential election, according to the U.S. Census Bureau. This drop‑off is particularly pronounced among younger voters, racial and ethnic minorities, and people with lower incomes.

Several factors explain lower midterm turnout. Many voters perceive less at stake when the presidency is not on the ballot. Media coverage also wanes, and campaign advertising tends to be less intense outside of competitive districts. Yet midterm turnout has been rising in recent cycles: the 2018 midterms saw a record high of about 49% of eligible voters, driven by strong enthusiasm among Democrats and a backlash against President Trump. The 2022 midterms, while slightly lower, still marked the second‑highest midterm turnout in decades, indicating that voters are increasingly aware of the importance of these elections.

Voter participation varies dramatically by state and by race. States with same‑day registration, automatic voter registration, or no‑excuse mail voting tend to have higher turnout. Voter ID laws, polling place closures, and limited early voting hours can suppress turnout, especially among communities of color. Midterms also see a higher proportion of older, white, and more educated voters relative to the general population, which can tilt policy outcomes toward their preferences on issues like Social Security, Medicare, and taxes.

Congressional Elections: House and Senate

The House of Representatives: All 435 Seats in Play

Every midterm election involves all 435 seats in the House of Representatives. Representatives serve two‑year terms, so every seat is up for grabs. This creates a nationalized environment where national issues—such as the economy, healthcare, immigration, and the president’s approval rating—heavily influence local races. Even in safe districts where an incumbent has held the seat for decades, national swings can flip a handful of seats and tip the balance of power.

The outcome in the House determines which party holds the speaker’s gavel and controls the legislative agenda. The majority party sets committee chairs, schedules floor votes, and decides which bills to advance. A shift of just a few seats can change the House from a cooperative partner to an adversarial opponent of the president, leading to legislative gridlock or forcing the president to rely on vetoes and executive orders. For example, after the 2010 midterms, Republicans gained 63 seats and took control, opposing much of President Obama’s agenda.

The Senate: One‑Third of Seats Every Two Years

Senators serve six‑year terms, so only about one‑third of the 100 Senate seats are contested in each midterm election. Because Senate terms are staggered, the exact set of seats up for election depends on the class: Class I, II, or III. The 2022 midterm, for instance, featured Class III seats (including those from states like Arizona, Georgia, and Ohio). In 2026, Class I will be on the ballot.

Senate races tend to draw more attention and money than House races because each state elects only two senators, so a single upset can shift the majority. Confirmation of Supreme Court justices, federal judges, and cabinet secretaries requires Senate approval. The majority leader controls which nominations and bills reach the floor. Since the filibuster allows a minority to block most legislation unless 60 senators vote to end debate, the exact composition matters greatly. Midterms often determine whether the president can pass signature legislation or must negotiate with a hostile Senate.

State and Local Races: Governors, Legislatures, and Ballot Measures

Governors and State Legislatures

Midterms also include elections for 36 governors (in most states) and thousands of state legislative seats. Governors play a critical role in setting state budgets, overseeing education and transportation, and managing public health emergencies. In many states, the governor can veto legislation and appoint state judges. State legislatures control redistricting, meaning the party that wins control after a midterm can draw electoral maps that favor their candidates for the next decade. The 2010 midterm, for example, produced a Republican wave that allowed the party to gerrymander districts in states like Pennsylvania, Ohio, and Wisconsin, locking in advantages through the 2020 census.

State‑level outcomes can also be a bellwether for national trends. A party that performs well in state races often builds a bench of experienced candidates for future federal runs. Moreover, state legislatures are responsible for ratifying proposed constitutional amendments—a role that gained attention after the Supreme Court’s 2022 decision overturning Roe v. Wade, which shifted the abortion debate back to state governments.

Ballot Measures and Referendums

In addition to candidates, many states and localities place ballot measures before voters during midterms. These can range from tax policies and minimum wage increases to marijuana legalization, voting rights, and environmental regulations. In 2022, voters in five states approved ballot measures to expand Medicaid, while in Michigan, a constitutional amendment protecting reproductive freedom was passed. Ballot measures allow citizens to bypass state legislatures and directly enact or reject laws, making midterms a powerful tool for grassroots activism.

Because turnout is lower and more partisan in midterms, the demographics of those who vote can skew the results of ballot measures. For instance, measures that require a supermajority for passage—such as some tax increase proposals—may fail in a low‑turnout environment even if they would win in a presidential year. Understanding the interplay between candidate races and ballot initiatives is crucial for grasping the full scope of midterm elections.

The Electoral Process and Campaign Dynamics

Primaries and General Elections

The midterm election cycle begins with primary elections, usually held between March and September of the election year. Primaries determine each party’s nominee for the general election. In many states, primaries are “open,” allowing independents or even members of the other party to vote; in others, they are “closed,” restricting participation to registered party members. Primary outcomes can push candidates toward more extreme positions to appeal to the party base, which may hurt them in a general election that attracts more moderate voters.

After the primaries, the general election campaign runs approximately two months, though the most competitive races may see continuous spending from the prior cycle. Presidential midterms often see a surge in campaign spending: the 2022 midterm cycle cost roughly $16.7 billion, according to the Federal Election Commission, making it the most expensive non‑presidential election in history. Much of this money flows through super PACs and dark‑money groups that do not have to disclose their donors, raising concerns about transparency and influence.

Media, Advertising, and Voter Information

Campaign advertising in midterms has shifted heavily toward digital platforms, though television remains dominant in older‑skewing media markets. Attack ads and issue‑based messaging are common, often focusing on economic anxiety, healthcare costs, or cultural issues such as crime and education. Social media amplifies polarizing messages, and misinformation campaigns—both foreign and domestic—have become a persistent feature of midterms since 2016.

Voter guides and non‑partisan organizations like the League of Women Voters and Ballotpedia help voters understand candidates and ballot measures. However, many voters still report confusion about what is on the ballot, especially in down‑ballot races for judges, school boards, and county commissioners. This “voter information gap” can depress participation and lead to less informed choices.

Impact on Governance and the Presidency

Legislative Gridlock and Bipartisan Deals

Perhaps the most immediate effect of midterm elections is their impact on the president’s ability to govern. If the president’s party loses control of one or both chambers of Congress, the legislative agenda stalls. The president may resort to executive orders and administrative rulemaking to achieve policy goals, but these are often challenged in court and can be reversed by a successor. Midterm losses also weaken the president’s standing within their own party, sometimes spurring primary challenges or leadership shake‑ups.

Conversely, if the president’s party gains seats (rare but possible, as in 2002 after 9/11), it can be interpreted as a mandate and enable more ambitious legislation. Even when the president loses Congress, divided government can produce bipartisan compromises on issues like infrastructure, criminal justice reform, or budget agreements—provided both sides are willing to negotiate.

The “Lame‑Duck” Period and Special Sessions

Midterms occur in November, but newly elected officials are not sworn in until January of the following year. The period between the election and the new Congress is known as the lame‑duck session. During this time, outgoing members and the sitting Congress can pass remaining bills, confirm judges, or act on other priorities that were stalled. Lame‑duck sessions have been used to enact controversial legislation that might not pass in the new Congress—for example, in 2010, during the lame‑duck, Congress passed the repeal of “Don’t Ask, Don’t Tell.”

The results of midterms also set the stage for the next presidential election. The party that performs better often gains momentum: volunteers, donors, and candidates are energized, and the media narrative around the incumbent president shifts. A strong midterm showing can build a party’s bench for the next cycle, while a weak showing can lead to soul‑searching and strategic changes.

The pattern of midterm losses for the president’s party is not a modern invention. In 1882, President Arthur’s Republicans lost 33 House seats. Similarly, President Hoover’s Republicans suffered a 101‑seat loss in 1930 during the Great Depression. The only exceptions in the post‑WWII era—1998 (President Clinton) and 2002 (President Bush)—occurred under unique circumstances: Clinton’s midterm followed the impeachment controversy that actually boosted Democratic turnout, and Bush’s came after the 9/11 attacks when national unity favored incumbents.

Some political scientists argue that the midterm penalty is partly structural: voters who turn out in midterms tend to be more partisan and more motivated by opposition to the president than by support. Additionally, the so‑called “surge and decline” theory holds that the coalition that elected the president is harder to reassemble in a lower‑turnout environment. These dynamics have been studied extensively by researchers at the Pew Research Center and academic institutions; for deeper reading, the Pew Research Center publishes regular analyses of midterm voter behavior.

Conclusion: Why Midterms Matter

Midterm elections are far more than a warm‑up for the next presidential contest. They directly reshape the balance of power in Washington and in state capitals, influencing everything from tax rates and healthcare access to voting laws and environmental regulations. Voter participation, while lower than in presidential years, has shown signs of increasing, and the issues at stake have never been more clearly drawn. Understanding what happens during midterms—the mechanics of congressional elections, the role of primaries and money, the impact on governance—is essential for any citizen who wants to make informed choices at the ballot box.

As the United States continues to face polarized debates over democracy, the economy, and social policy, the midterm election remains one of the most powerful tools for the public to hold government accountable. The next midterm in 2026 will offer another critical test of whether the nation’s political institutions can respond to the will of the people—and whether enough voters will show up to make their voices heard.