Democrats secured a landslide victory in congressional elections, and the market now fears that approval and expansion of AI data center construction will be restricted—dealing a heavy blow to the semiconductor and technology sectors and triggering one of the largest single-day wealth contractions in the history of the Bloomberg global rich list. Nvidia CEO Jensen Huang's personal net worth fell sharply in a single day, dropping him out of the ranks of the world's ten richest people, while Nvidia's stock price posted its largest single-day decline since January 2025. Musk and Larry Ellison also suffered heavy losses. The 500 billionaires on the Bloomberg Billionaires Index saw their combined wealth shrink by $185 billion that day—the 14th-largest single-day drop since the index was created in 2012. The core logic behind the market selloff is investors' fear that once Democrats control both the Senate and the House, they will restrict approval and expansion of data centers—a key pillar of AI—directly weighing on the stock prices of semiconductor manufacturers and computing power suppliers. Nvidia, SpaceX, and Oracle all fell sharply, as all three companies' core businesses are deeply tied to the expansion of AI data centers. Previously, under the AI wave, tech billionaires held a high share of wealth and were on track for their best annual performance. This large single-day wealth loss reflects the group's high sensitivity to changes in AI policy expectations, and also highlights the vulnerability of wealth highly concentrated in the AI infrastructure track when election results shift the policy balance.