U.S. stocks opened marginally higher on Monday as investors braced for any new developments in a probe of Democratic Presidential nominee Hillary Clinton's alleged misuse of a private email server. The S&P 500 index gained 4 points, or 0.1%, to 2,129. The Dow Jones Industrial Average advanced 26 points, or 0.1%, to 18,178. The Nasdaq Composite Index rose 16 points, or 0.1%, to 5,206.
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