How will the US midterms affect Australian markets?

The US midterms in November could significantly impact Australian markets, according to polling data. Democrats are favored to take control of the House of Representatives, but the Senate race remains too close to call. If Republicans maintain both chambers, a "Santa rally" could boost markets worldwide, including Australia. However, this short-term gain is likely to be followed by economic headwinds such as high debt servicing, inflation, and employment pressures.

A Republican victory would strengthen Trump's pro-market stance, potentially benefiting the technology sector. Democrats controlling the House and Republicans controlling the Senate could curb Trump's spending measures, but a lack of legislative progress for Democrats may occur due to Senate opposition. A split Congress might lead to a contentious debt-ceiling fight, potentially rattling global equities.

The conflict with Iran and its impact on oil prices remains uncertain, as Trump did not seek approval before recent strikes. If Democrats gain control of both chambers, they could exercise more influence over spending and debt-ceiling negotiations, despite Trump's veto power and ability to govern via executive order. Targeted pushes by Democrats may increase renewable energy supplies, battery production, and EV incentives, which have dwindled under the Trump administration.

While a Republican hold could spark a near-term market boom, a Democratic sweep might be more favorable in the long term due to the pragmatic nature Democrats are expected to bring during uncertain times. However, a contested or disputed midterm result could create policy uncertainty, potentially weighing on commodities and creating challenges for companies in the ASX's largest sector.