The Wall Street Journal is considering how the new congress will affect different market segments:
“Watch out for anyone who tells you “divided government is good for the stock market.” The historical basis for this – such as data since 1949 via the Stock Trader’s Almanac-is meager. You can’t extrapolate universal rules from such a small amount of data. The results are too heavily skewed by the Reagan (1981-86) and Clinton (1995-2001) booms under divided governments. “The mantra that gridlock is good for the markets is not borne out by the evidence,” says Bob Johnson, senior managing director at the CFA Institute, a trade organization for professional investors.”
You find the details here.