About 60 per cent or six in 10 US presidential debate watchers said former Vice President Joe Biden did the best job in Tuesday's debate, and just 28 per cent say President Donald Trump did, according a CNN Poll of debate watchers conducted by SSRS.
In interviews with the same voters conducted before the debate, 56 per cent said they expected Biden to do the better job while 43 per cent expected that Trump would.
The post-debate result is about the same as the outcome of a post-debate poll in 2016 after the first debate between Trump and Hillary Clinton. In that poll, 62 per cent thought Clinton won the debate, 27 per cent said Trump did.
About two-thirds said Biden's answers were more truthful than Trump's (65 per cent Biden to 29 per cent Trump), and his attacks on the President were more frequently seen as fair. Overall, 69 per cent called Biden's attacks on Trump fair while just 32 per cent said Trump's attacks were fair.
The survey, however, is designed to be representative of those registered voters who watched Tuesday's debate, it does not represent the views of all Americans.
The voters who watched the debate were more partisan than Americans as a whole -- 36 per cent identified as independents or non-partisans compared with around 40 per cent in the general public, and the group of debate watchers was more Democratic than a typical survey of all adults, with 39 per cent identifying as Democrats and 25 per cent as Republicans.
Beyond overall praise for his performance, voters who watched the debate largely said that they trusted the former vice president over the current President on major issues covered in the debate, including racial inequality (66 per cent trust Biden more, 29 per cent Trump), health care (66 per cent Biden to 32 per cent Trump), the coronavirus outbreak (64 per cent Biden to 34 per cent Trump) and Supreme Court nominations (54 per cent Biden to 43 per cent Trump).
On the economy, though, voters who watched the debate split, with 50 per cent saying they preferred Biden and 48 per cent Trump.
Overall, 63 per cent who watched the debate said Biden had the better plan for solving the country's problems (30 per cent said Trump did), and that he seemed to be the stronger leader (55 per cent Biden to 43 per cent Trump).
The debate did not appear to dramatically move voters who watched in either vote preferences or their overall impressions of the two candidates.
A majority of debate watchers (57 per cent) said that Tuesday's debate did not affect their choice for president, while the minority who said they were moved were more apt to say they became more likely to vote Biden (32 per cent) than Trump (11 per cent). Biden was, however, viewed as having better addressed concerns about his candidacy (59 per cent Biden to 37 per cent Trump).
Favourable views of both candidates were largely steady (62 per cent had a favorable view of Biden, just 35 per cent had a favourable view of Trump) when compared with the pre-debate results among the same people (60 per cent had a favourable view of Biden, 37 per cent had a favourable view of Trump).
The CNN post-debate poll was conducted by SSRS by telephone and includes interviews with 568 registered voters who watched the September 29 debate. Results among debate-watchers have a margin of sampling error of plus or minus 6.3 percentage points. Respondents were originally interviewed September 22-27 either by telephone or online, and indicated they planned to watch the debate and would be willing to be re-interviewed when it was over. Respondents initially reached online are members of the SSRS Opinion Panel, a nationally representative probability-based panel.