Stock futures plunge as Democrats overperform in US midterm elections

Why This Matters

• A Democratic Congress could complicate negotiations over government spending and the debt ceiling; Yardeni warns prolonged shutdowns and fiscal standoffs could push Treasury yields higher and weigh on equity valuations.
• The gubernatorial races in Texas and Ohio matter beyond politics: both states are major data-center hot spots, and a backlash against breakneck development could slow the AI trade.
• Yardeni argues that with the midterms over, Trump may feel less politically constrained and more willing to pursue controversial policies through executive action, which a Democratic Congress cannot easily restrain.

Background

US midterm elections, held halfway through a presidential term, decide control of the House of Representatives, about a third of the Senate and numerous governorships, and are widely read as a referendum on the sitting president. Investors have generally favoured divided government on the theory that gridlock prevents either party from pushing policy to extremes, a preference Tuesday night's market reaction suggests is being questioned. During the current term, Fortune reports, President Trump has relied heavily on executive authority, carrying out his most market-moving policies, namely tariffs and the Iran war, without congressional approval.

Key Perspectives

• Ed Yardeni, market veteran: warns deepening partisanship could turn gridlock into 'damaging political paralysis' while bond investors grow uneasy about US debt and deficits. A Democratic sweep could complicate spending and debt-ceiling negotiations, and a 'blue wave' could deliver 'a cold shower for stocks', though he would view a significant selloff as a buying opportunity given the strength of the economy and corporate earnings.
• Donald Trump, US President: told the Financial Times he has no immediate plans to strike Iran, sending oil prices lower.

What to Watch

• Whether Democratic leads in South Carolina, Texas and Kansas hold as the remaining races are called.
• Whether Democratic gubernatorial leads in Texas and Ohio translate into policy that slows data-center development, and the AI trade with it.
• Whether government spending and debt-ceiling negotiations become the first flashpoint between a Democratic Congress and President Trump.