There will be things about gridlock the market doesn't like," said Ed Mills, Washington policy analyst at Raymond James.
Meanwhile, under a Republican president, the stock market on average gains 4.9% when Democrats control Congress, and the market gains 7.3% with a split Congress.
Strategas Research says the stock market is signaling that Republicans may sweep the election .
There are clear stock market winners from a Republican victory, at least in the House.
Laperriere, in a note, wrote that tech, small cap and financial firms are most vulnerable to higher taxes and tougher regulations, and they could benefit from a Republican Congress.