The S&P 500 and Dow Jones surged, with the Dow gaining 628.5 points, or 1.49%, to reach 42,850.4 at the open, while the S&P 500 rose 82.1 points, or 1.42%, to 5,864.89. The Nasdaq Composite also climbed, adding 333.6 points, or 1.81%, to start at 18,772.76.