I certainly hope so.
It depends on what "winning big" means. The market probably thinks "collectively" that the GOP will gain 55-60 House seats, and 8 to 9 Senate seats. It has already discounted for these estimates; the are figured into the prices. Any gains more than this would be generally bullish. Any gains less than this would be generally bearish.
There is also the general bearish factor of the inane leftist legislation the lame duck 'Rat Congress might try to perpetrate on vulnerable corporations between Election Day and the swearing in of the new Congress at the end of the year.
Obviously, there will be individual differences in the effects of the new Congress upon each company and each industry that have to be considered in making market decisions.
A GOP win will probably restore some confidence....