
Clinton holds a three-point lead over Trump, according to a New York Times/CBS News poll of likely voters. The S&P 500 had fallen seven straight days as Trump gained in the polls.
The market is anxious over a potential Trump win because of his penchant for controversy and his broad criticism of free trade, the Federal Reserve and other targets.
Five minutes into trading, the Dow Jones Industrial Average was at 17,982.93, up 0.1 percent.
The broad-based S&P 500 rose 0.1 percent to 2,100.19, while the tech-rich Nasdaq Composite Index climbed 0.1 percent to 5,112.64.