BIDEN got the highest overall marks for his debate performance, but it's really very close among the top 5.
— Nate Silver (@NateSilver538) December 20, 2019
KLOBUCHAR and YANG performed best relative to their pre-debate favorability ratings.
BUTTIGIEG and STEYER underperformed relative to their favorability ratings going in. pic.twitter.com/japiRW5uCp