Midterm Elections and Geopolitical Risk Will Drive the Market

As we move through 2026, the political and geopolitical landscapes remain key drivers of policy uncertainty. For the midterm elections, our base case is a Democratic House and Republican Senate, a historically favorable outcome for equities. Meanwhile, the US-China relationship has stabilized modestly, and multiple Trump-Xi meetings are expected this year, creating opportunities for incremental progress, with key questions around export controls and access to advanced technology unresolved. Geopolitical risks remain elevated, particularly amid the ongoing US-Iran tensions. While markets have remained resilient to geopolitical flareups so far, a prolonged conflict or sustained pressure on energy prices could weigh on economic activity and introduce greater market volatility.

Base case for the 2026 midterm elections

Our base case remains a Democratic House and Republican Senate. Divided government historically has provided for a market-friendly backdrop, limiting legislative surprises, but President Donald Trump’s use of executive action could continue to drive uncertainty and volatility. As we have framed all year, elections ultimately remain a math problem.

Republicans enter the cycle with a 220-215 House majority. Holding a majority would require 218 seats, and several structural challenges against Republicans present an opportunity for Democrats to capture a majority – including an unfavorable national environment, weak presidential approval ratings, elevated voter dissatisfaction and an energized Democratic base. Redistricting efforts could add anywhere from four to eight seats to the Republican column and reduce Democratic gains. In the Senate, Democrats would need to net four seats out of the 33 Senate races. Midterm Senate election results tend to match the presidential results in most states.

An analysis of previous midterms shows there is a 20%-29% deviation between the winner of the Senate election and the state’s preference in the previous presidential election. For Democrats to win the Senate, they would need a 67% deviation. Not impossible, but a significant departure from recent midterm election results.

The impact of divided government on policy

Traditionally, policymaking is limited to bipartisan efforts in divided governments. Volatility occurs on must-pass legislation such as government funding bills, increasing the risk of government shutdowns. A key issue after the election will be how Democrats and Trump approach policy debates. Will Democrats and Trump work together or will they seek to define the other as the obstacle? In his second term, Trump has increasingly used executive action and emergency powers to implement policy. The unpredictable nature of these efforts – for example, the April 2025 tariff announcement – has caused significant market volatility. Markets have become more accustomed to this style and the courts have limited some of these actions, but it may usher in a different policy environment than previous divided government scenarios.