[US Midterm Elections] The Ruling Party Retains Power vs. The Opposition Recaptures It: What Changes with These Two Divergent Paths
The results of the midterm elections can be broadly understood through two divergent paths: either the ruling party retains control of both the House and the Senate, or the opposition party recaptures part or all of them. In this article, we will break down what changes for the stock market under these two scenarios.
General trends indicated by historical data
Statistically, in midterm elections, the party of the incumbent president (the ruling party) has lost seats in the majority of past elections. This is often explained by a phenomenon in behavioral economics known as the "disappointment of expectations." In a presidential election year, voters cast their ballots with high expectations for a candidate's promises. However, two years into the administration, as policies fail to progress as promised or dissatisfaction grows regarding prices and employment—which directly impact daily life—those expectations are revised downward. The midterm election is viewed as the venue where this "correction of expectations" is expressed through votes.
However, this is merely a historical trend and does not guarantee the outcome of this election. Actual results can change depending on the economic conditions, approval ratings, and individual political events of the time. Please check primary sources such as opinion polls for the latest situation as the election approaches.
From here on, we will specifically organize what changes for the stock market under each path: "Ruling Party Retains Power" and "Opposition Recaptures Power." We will also introduce a perspective for checking whether your portfolio is skewed toward either path. If you want to know what to check while waiting for the election results, please continue reading.
Path A: The ruling party retains both the House and the Senate
If the ruling party retains both chambers, the policies proposed by the administration will likely proceed relatively smoothly in terms of both fiscal policy (House) and appointments or regulations (Senate).
In this case, the direction the market prices in is a scenario where the ruling party's policy line is strengthened. If the policy is tax cuts, expectations for tax cuts will likely increase; if it is deregulation, expectations for deregulation will likely increase. On the other hand, the fact that policy swings are likely to be larger also means that the difference between sectors that benefit from those policies and sectors that face headwinds will become more distinct.
Path B: The opposition party recaptures part or all of the chambers
If the opposition party recaptures either the House or the Senate, or both, a state of "divided government"—which I have introduced before—or a state where the administration's policy implementation power is even more constrained, will emerge. Large-scale new budgets or major changes to existing systems will become difficult to realize, and policies will likely trend toward a status quo.
In this case, it is pointed out that sectors less susceptible to policy swings, such as defensive sectors like healthcare and consumer staples, are more likely to be relatively favored in the market. Conversely, sectors that were strongly dependent on the ruling party's policy line are more likely to face headwinds in the form of retreating expectations.
It is not about which is "good" or "bad," but about being aware of which one you are betting on
What is important here is not to judge as an investor which path is a "good result" and which is a "bad result." This article does not advocate for the victory of any specific political party.
What is important is to check whether your portfolio has unconsciously become a bet on one of these paths. If you hold many stocks based on the premise of the realization of specific policies, you need to anticipate the impact if that premise collapses. Conversely, you can also consider incorporating a certain amount of defensive sectors so that you are not significantly damaged by either path.
Summary
The results of the midterm elections can be broadly understood through two divergent paths: "the ruling party retains both the House and the Senate" or "the opposition party recaptures part or all of them." While historical data shows that the latter (an increase in opposition seats) has been the majority, this is a trend and not a fixed future. In Path A, the direction of policy is likely to be strengthened, while in Path B, policy is likely to approach the status quo, and defensive sectors are likely to be relatively favored. You should check in advance whether your portfolio is skewed toward either path.
Detailed analysis of past election data and sector strategies for each scenario are explained in the Kindle book "US Midterm Elections: US Stock Survival Strategy for Late 2026". It is eligible for Kindle Unlimited, so those with an all-you-can-read subscription can read it at no additional cost.
What specifically passes and what gets blocked in a divided government is explained in the following article.
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※ This article is for informational purposes only and does not express support or opposition to any specific political party or candidate. It does not recommend the buying or selling of specific stocks, and please make final investment decisions at your own responsibility.