The Dow Jones Industrial Average fell 197.26 points, or 0.38%, to 51786.72. Meanwhile, the broad S&P 500 gained 27.52 points, or 0.36%, to 7568.92 and the tech-heavy Nasdaq Composite rose 207.65 points, or 0.83%, to 25372.01. Investors showed trepidation ahead of midterm election results and skepticism about a near-term resolution to the Iran conflict.