Greg Branch, 1847Financial and Yana Barton, Eaton Vance Management, join 'Power Lunch' to talk about market volatility as we get closer to elections. For access to live and exclusive video from CNBC subscribe to CNBC PRO: https://cnb.cx/2NGeIvi

Wall Street thinks it won’t be just a long election night on Nov. 3. It could be a long election month.

The September CNBC Fed Survey finds 47% of respondents think the winner of the presidential election won’t be known for a week after Election Day. More than a third — 36% — said it could take a month or longer. Just 6% believe the winner will be known on election night and another 6% think it will be known within two days.

And 86% of the 37 respondents — fund managers, strategists and economists — said a contested election is a current risk to the stock market.

“To me, the balance of the year’s market activity will depend more on what happens in the congressional elections vs. the presidential election,” said Kevin Giddis, chief fixed income strategist at Raymond James Financial. “Look for volatility in both stocks and bonds to significantly increase by the end of October.”

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