U.S. midterm elections have become a key concern for stocks benefiting from the AI boom as recent polls and prediction-market results increasingly favor Democrats. The trend suggests Democrats could regain control of at least one chamber of Congress. Wall Street strategists say such an outcome could weigh on richly valued AI shares, which have limited room for disappointing developments. Investigations, congressional hearings and tighter regulatory measures could add to the pressure. Brian Mulberry, chief market strategist at Zacks Investment, said a strong Democratic performance in the November election could increase both the number and prominence of hearings focused on AI safety. Tobin Marcus, a strategist at Wolfe Research, expects Democrats could establish an AI special committee to question industry executives and potentially issue subpoenas. Developments from Washington could heighten traders' concerns about congressional action and increase volatility across AI-related sectors.