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US midterm election risk is emerging as a key concern for equity investors amid a surge in AI-driven trading. Recent polls and prediction markets have shifted toward the Democrats, increasing the odds they retake at least one chamber. Strategists warn a Democratic gain could pressure richly valued AI beneficiaries: more investigations, hearings and tougher regulation from Congress would be negative for the sector. Zacks Investment chief market strategist Brian Mulberry said strong Democratic performance in November could raise both the number and intensity of AI-security hearings, prompting trader concern about congressional action and volatility in AI-related stocks. Wolfe Research strategist Tobin Marcus expects Democrats may form an "AI special committee" to question industry executives and could issue subpoenas.