Democratic Midterm Wins Put 34% S&P 500 AI Weight in Regulatory Spotlight

Democratic midterm wins renew scrutiny of AI infrastructure and model development. Goldman Sachs sees construction halts affecting about 45% of planned US datacenter capacity, while the Magnificent Seven are roughly 34% of the S&P 500. Big Tech plans over $740 billion of 2026 capex, up from about $400 billion last year, keeping regulatory risk and AI returns in focus.