U.S. stocks gain for second session as Brexit vote looms

U.S. stocks gained for a second session on Tuesday as investors continued to monitor the latest developments out of the U.K. as the country prepared to go to the polls to decide on its membership in the European Union. The latest survey indicated that 45% of voters backed remaining in the EU versus 44% who favored leaving. Stocks had earlier come under pressure after Federal Reserve Chairwoman Janet Yellen testified at the Senate that a victory for the "leave camp" would pose a significant risk to the U.S. economy. The S&P 500 rose 6 points, or 0.3%, to close at 2,088. The Dow Jones Industrial Average added 23 points, or 0.1%, to finish at 17,827 and the Nasdaq Composite gained 7 points, or 0.1% to close at 4,843.

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