Michigan consumer confidence first hit this low level in April of 1980. It's noteworthy that between that point and the end of 1980, the S&P 500 rallied 36%, from 100 to 136. The market did end up giving that rally back between 1981 and 1982 though.
The other times Michigan confidence was this low were in November of 2008 and March of 2009. Recall that the S&P 500 bottomed in the 700s in November 08 and had a 30% rally from there through the end of December before hitting a longer term bottom in March of 09 at 666.