Is Joe Biden mentally fit enough to effectively carry out the responsibilities of the U. S. presidency?

I've seen many polls and opinions that could potentially be biased so I wanted to get a sense of what this community thinks.

Joe Biden is mentally fit and can fulfill the responsibilities of the U. S. presidency.
Joe Biden is not mentally fit enough to fulfill the responsibilities of the U. S. presidency.
Select gender and age to cast your vote:
Is Joe Biden mentally fit enough to effectively carry out the responsibilities of the U. S. presidency?
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