Woo said market history points to the potential for a huge Clinton victory. Ahead of presidential elections since 1960, the stock market behaved very differently when the presidential candidate won by a wide margin versus a narrow margin of Electoral College votes.
In the 90 days leading up to the election, the S&P 500 was up an average 8.4 percent when the candidate won with a margin of more than 80 percent of the Electoral College, according to Woo.
Those instances were in 1964, when Lyndon Johnson was elected, 1972 with Richard Nixon, and both victories by Ronald Reagan in 1980 and 1984. But when the margin was less than 20 percent, like in the 1960 election when John Kennedy was elected, 1976 when Jimmy Carter was elected or in both elections of George W. Bush, the S&P averaged a slightly negative return.
"Since July 5, the S&P has gone up about 4.5 percent. We're now at the midpoint mark of this 90 day rule. The last time the stock market was up this much at the halfway mark was when Ronald Reagan went on to defeat Walter Mondale in a landslide victory. The market is not only pricing a Hillary victory. The market is pricing in a landslide Hillary victory," said Woo.
Woo said there's a consensus view on Wall Street that Trump would be bad news for the market, and that he would bring on a trade war with China. "I don't believe that Trump is necessarily bad for business, " he said.
"The only thing we could say about a Trump victory is a lot more fiscal stimulus. If half the stuff he's talking about is true, the economy would take off. This would be the first time you get a fiscal stimulus when you're not in the middle of a recession," he said. "If we get a Trump clean sweep, this would be very bullish for the U.S. dollar but also very bearish for Treasurys."