S&P 500 to Hit 800 Points by Sept.

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Martin Marnick, executive director at Helmsman Global Trading, believes markets will drift lower as volumes start to erode on Wall Street. He tells CNBC's Rebecca Meehan and Chloe Cho the S&P 500 will slide to 800 points by September.

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S&P 500 to Hit 800 Points by Sept.

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