A new Data for Progress flash poll fielded the following day finds that voters believe Biden performed worse than Trump during the debate. However, there is no clear indication that alternative Democrats would perform better than Biden in a head-to-head matchup against Trump.
When asked to choose which candidate trait they’re more concerned about, 53% of voters say they are more concerned about Biden’s age and physical and mental health, while 42% say they are more concerned about Trump’s criminal charges and threats to democracy.
This is the most comprehensive poll out there. It vehemently confirms all the (credible) rumours that we're hearing about Biden's imminent drop-out as democratic candidate.
Not surprised, the results are very similar to the poll we conducted right after the debate was over. The link to our Poll #589196