Investors and analysts say Wall Street is not yet pricing in a Democratic sweep of Congress. A blue wave could weigh on the S&P 500 on Wednesday, while a Republican hold could spark a short-term relief rally.
The stock market is not yet pricing in a Democratic sweep of Congress, even though some polls and most prediction markets point that way, according to investors and analysts. A sweep could therefore weigh on share prices Wednesday.
Republicans keeping control, by contrast, could cause a short-term relief rally, they said.
Wall Street banks size up Wednesday's move
JPMorgan sees a blue wave knocking the S&P 500 by about a half percent on Wednesday. If Republicans lose the House but keep the Senate, JPMorgan traders predict up to a 1% pop.
Tobin Marcus of Wolfe Research said investors are signaling begrudging acceptance of a Democratic sweep, but are not positioning that way. The firm's survey of more than 100 institutional investors suggests they are not strongly positioned for any particular result.
History favors a rally, but this year may differ
Stocks tend to rally after midterms: the S&P 500 was up one year out after all midterm elections going back to the early 1980s. Yet the index has already recorded double-digit gains so far in 2026, and some on Wall Street worry that investors are overly complacent.
BTIG's Jonathan Krinsky found that in midterm years the S&P 500 has typically averaged a 14% drawdown at some point in the second half. Krinsky wrote that the setup is the opposite this year, and that while consensus expects a post-midterm rally, he thinks the opposite is more likely.
AI, defense and banks in focus
Democratic strength could pressure the AI trade even more after the Nasdaq Composite posted its worst day since June on Friday. Goldman Sachs strategists said a Democratic Congress might limit data center tax incentives, but a national moratorium looks unlikely in any election outcome.
Defense shares might also face pressure in a blue wave, while health care stocks could gain, analysts and investors said. Financials, up around 3% this year, could get more unstable if Democrats pursue credit card rate caps.
Iran remains a wildcard
Trump could restart the war against Iran after holding off any major strikes before the midterms. Evercore ISI said the S&P 500 could retreat by double-digits to end the year at 6,800 if he escalates and Democrats take Congress.
Source: CNBC
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