Even in 2021 and 2022 Biden was likely not fit to run for re-election. He could not get sentences out. He could not barnstorm the country. He could not make a case like Barack Obama could. He couldn’t skewer false Republican talking points like other Democratic politicians could. He shouldn’t have run again.
https://www.theguardian.com/news/ng-interactive/2025/may/18/biden-book-health-original-sin