Quick Read
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Adam Levy notes the S&P 500 has risen in all 20 completed 12-month periods after midterms since 1946, averaging about 15%.
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AI companies now make up over 30% of the S&P 500, so Democratic pressure on data center power use threatens the market's biggest theme.
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The Nasdaq-heavy QQQ has dropped about 13% in a month, while the Dow ETF DIA slid under 1% after the election.
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Voters handed Democrats both the House and the Senate in the November 3 midterms, so President Donald Trump will govern with a divided Congress starting in January 2027. Wall Street liked the result at first: the Dow posted its biggest gain of the year the next day. Then the mood turned. The tech-heavy index plunged 5.56% on November 5 as investors began pricing in tighter regulation of AI infrastructure. The VIX, Wall Street's fear gauge, rose to 28.18 from 16.61 a session earlier.
That swing raises a question for investors. Eighty years of midterm history point to a good year ahead for stocks. This cycle could still test that record because so much of the market now rides on one theme.
A Post-Midterm Winning Streak That Has Never Broken
The S&P 500 has risen in all 20 completed 12-month periods after midterm elections since 1946, gaining 14.7% on average. Divided government barely changes that. In 16 of the 21 midterms since 1946, voters sent the president a Congress controlled by the other party. The average 12-month return was 14.6% under divided government and 14.9% under unified government.
Today's setup has the best record of all. The nine instances of a Democratic Congress combined with a Republican president produced an average S&P 500 gain of 16.2% over the following year. Gridlock means fewer policy shocks, a point Reuters reported traders were cheering right after the results.
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Why AI Makes 2026 a Different Test
AI-related companies now make up more than 30% of the S&P 500, and Democrats may push for tighter regulation of how much electricity and water data centers use. That pressure is building on its own. The Department of Energy projects data centers could account for up to 12% of U.S. electrical demand by 2028. PJM Interconnection's independent market monitor called data center load growth "the primary reason" for tight supply and high capacity prices on its grid. Even without passing a law, a Congress with committee control can slow permitting through hearings alone.
Investors are already sorting winners from losers. From election day through November 6, the SPDR S&P 500 ETF Trust( NYSEARCA:SPY ) fell 2.53% while the SPDR Dow Jones Industrial Average ETF Trust( NYSEARCA:DIA ) slid just 0.94%. The tech-heavy Invesco QQQ Trust( NASDAQ:QQQ ) is down 13.41% over the past month.
Macro Fundamentals Will Outweigh the Ballot
Who controls Congress is just one factor among many. The economy grew at a 3.4% annualized pace in the third quarter. The 10-year Treasury yield has fallen to 4.84% from 5.24% in early October, which helps growth-stock valuations. The Fed's target rate is capped at 4.00%. Households are the weak spot: University of Michigan consumer sentiment fell to 48.1 in September, below the index's recession threshold.
Keep the history in perspective. The samples are small, and returns ultimately come down to earnings, interest rates and valuations.
Signals That Will Decide the Next 12 Months
For a diversified portfolio, the Democratic sweep has historically been a good setup. The exposure worth a closer look is concentration in AI. Three signals matter most over the next two quarters:
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Which Democrats take over the energy and commerce committees in January, and whether their first hearings go after data center power costs.
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Whether the big cloud companies hold or trim their capital spending plans in their next earnings reports.
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Whether the VIX drops back below 20. If fear passes, the November selloff was a repricing. If it stays high, the AI trade has a policy problem.
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