'Blue wave' of course refers to a Biden win and the Senate changing hands.

Our market views remain broadly procyclical, consistent with our above-consensus global growth forecast. While a blue wave would have mixed implications for broad US equity indices

GS see a negative in the form of:

  • a sizable increase in the corporate income tax rate by up to 7 percentage points

But positives as:

  • would likely result in substantially easier US fiscal policy
  • a reduced risk of renewed trade escalation
  • and a firmer global growth outlook

More:

  • These shifts should be clearly positive for cyclical sectors, as well as firms that pay most of their taxes outside the United States. In addition, we would expect a material backup in longer-term sovereign bond yields as well as support for our standing forecasts of higher commodity prices and a weaker US dollar.

(bolding mine).