Bloomberg/Morning Consult poll of nearly 5,000 (all online smh):
Less than half of respondents said his almost-certain rival, 77-year-old Donald Trump, was too old. Still, Trump faces his own vulnerabilities with swing-state voters, with a majority saying the former president is dangerous. ...
Almost six in 10 swing-state voters labeled Trump as dangerous — a concern far more pronounced among undecided voters, who make up less than one-tenth of the swing-state electorate. Even 28% of those who plan to vote for him in November agree that Trump is dangerous. Fewer than half as many Biden supporters said the same about their candidate.
Swing-state voters who volunteered that they had heard something about his recent comments degrading NATO were especially lopsided in thinking Trump was the more dangerous of the two candidates.