Democrats’ midterm rout of Republicans, also framed as a rebuke of President Donald Trump, cast doubt on large AI data-center plans and jolted markets Thursday. Nvidia fell 9.3%, AMD 17.3%, Microsoft 3.6%, Micron 17.5%, Broadcom 10.4%, Tesla 10.8% and SpaceX 9.1%; neocloud names Nebius dropped 15%,