The survey conducted by SSRS Research found that 63% of 605 debate watchers polled said Harris had turned in a better performance onstage in Philadelphia, versus 37% who said Trump did a better job.
Prior to the debate, the voters were evenly split, with 50% saying Harris would perform more strongly and 50% believing that Trump would.
On August 23-27, ABC News and Ipsos conducted a poll among 2,496 respondents. According to the poll results, 43% thought that Harris would beat Trump in the debate, and 37% said that Trump would succeed.
Donald Trump and Kamala Harris faced off on ABC News on Tuesday night for the first time since Harris entered the race. The US presidential election will be held on November 5.