Democratic presidential candidate Hillary Clinton celebrates on stage during her primary night event at the Duggal Greenhouse, Brooklyn Navy Yard, June 7, 2016 in New York.

Wall Street is pricing in a landslide victory for Hillary Clinton, but if she starts to lag, there could be a big unwinding of stock and bond market positions, according to Bank of America Merrill Lynch's David Woo.

Woo said the market is also pricing in a split Congress, with Republicans controlling the House and Democrats the Senate. That would maintain the deadlock in Washington.