Ahead of the first debate, Biden had been leading in the polls, on a national level and in crucial battleground states.
Biden has hovered around 50% in recent months and has had a 10-point lead on occasions. The latest average of election polls gave Biden a 6.1 lead over Trump, according to data collated by RealClearPolitics.
Analysts said Trump needed a strong showing in the first debate to move the needle of public opinion and catch up with Biden. It remains to be seen if Trump did enough in the debate to improve his standing in the polls.