Democrats Just Swept Congress — and 80 Years of Stock Market History Says This Happens Next

Quick Read

• Adam Levy notes the S&P 500 has risen in all 20 completed 12-month periods after midterms since 1946, averaging about 15%.

• 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.

• The Nasdaq-heavy QQQ has dropped about 13% in a month, while the Dow ETF DIA slid under 1% after the election.

• Building a portfolio and living off one are two completely different skills, and almost nobody teaches the second. This problem is what The Definitive Guide to Retirement Income helps, and it is free today. Read more here. (Sponsor)

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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