Dow scores its best day in 18 months in a broad relief rally after Democrats sweep to power in Congress

Stocks rallied sharply on Wednesday, with the Dow posting its best single-day gain in 18 months, as investors welcomed the outcome of congressional elections. The sweep by Democrats was read by markets as raising the odds of a faster resolution to the Iran war, and that optimism fed through to several asset classes at once. Oil prices fell sharply and bond yields declined, a combination that typically signals investors are pricing in less inflation pressure and a more stable geopolitical backdrop.

The breadth of the move is notable. Gains were not confined to a single sector, which suggests the rally reflected a shift in overall risk sentiment rather than company-specific news. Falling crude prices matter for input costs and household budgets, while lower yields can ease borrowing costs across the economy.

What to watch from here: whether the political shift translates into concrete steps toward ending the conflict, and whether the drop in oil and yields holds. Markets often price in expectations before outcomes are confirmed, so follow-through will depend on developments on the ground rather than the election result alone.