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Why Tuesday's Midterms Are a Risk for AI Stocks
Investors treat Tuesday's US midterms as a risk for AI stocks: a Democratic Congress would bring hearings and pressure on data centers. New laws would likely face a presidential veto.
Americans vote on Tuesday, November 3, and for once the result is being traded as an AI story. Bloomberg reported on October 30 that AI policy fears were gripping stock and bond traders with the midterms days away. Polls show Democrats as heavy favourites to win the House of Representatives, Bloomberg reported earlier in October, and trading on the prediction markets Kalshi and Polymarket has shown a Democratic sweep of both chambers as the most likely outcome, according to Reuters.
The worry is less about new laws than about oversight. Control of a chamber gives a party the committees that propose legislation and open investigations. "There will be congressional hearings. There will be investigations," Stifel's chief Washington policy strategist Brian Gardner told Reuters. Wolfe Research's Tobin Marcus expects AI safety to be "a more live subject for Congress in 2027" and Democrats to form a select committee on AI able to issue subpoenas. President Trump, who backs the industry, would be likely to veto restrictive bills, which is why BCA Research's Matt Gertken said Washington "probably won't be slamming the brakes on capex and construction."
Data centers are where the politics are sharpest. A Reuters/Ipsos poll released in October found that 69% of Democratic registered voters support limits on data center construction, against 43% of Republicans. Investors are also watching governor and legislature contests in at least six states, including Texas, where power and permitting decisions are made. "Data centers are a real political issue, a really salient one in these state and local races," said Maxwell Shulman of Beacon Policy Advisors. Spending on data centers and other AI infrastructure is expected to exceed $1 trillion next year, Reuters reported.
Strategists disagree on how much it matters. Bank of America's Michael Hartnett warned in August that a Democratic sweep of the House, the Senate and Texas could push US stocks down 10%, and Citigroup's Scott Chronert called a sweep "a marginal negative in our view for the AI trade." On October 20 Citadel Securities' Scott Rubner argued the opposite way: many clients see the vote as a hurdle to clear before adding risk, so AI shares could outperform again once it has passed. BNY Wealth's Kevin Shea said policy uncertainty could "disrupt the timing and the cost" of projects but was unlikely to derail the theme.
The distinction worth keeping is between headlines and cash flows. Hearings can move share prices for a day; AI earnings depend on whether data centers are built and connected to power on schedule. A change of control in Washington would mostly add noise to that, while the decisions that can actually delay construction sit with state legislatures, utility commissions and local permits, several of which are also on Tuesday's ballot.
Sources: Bloomberg — AI policy fears grip stock, bond traders with midterms days away (Oct 30, 2026); Reuters via Kitco — Investors see risk from US midterms to AI trade as data center backlash builds (Oct 22, 2026); Bloomberg Government — AI darlings, defense shares most at risk as US midterms near (Oct 8, 2026); Bloomingbit — Citadel Securities' Rubner says AI trade to gain after midterms, citing Bloomberg (Oct 20, 2026); Briefs Finance — Midterms put AI highfliers on notice (Sep 24, 2026)