Let’s do the tests AFTER he is retired next month. As VP, he is the gift (to conservatives) that keeps on giving!!
Biden is, without a doubt, the stupidest (or most demented) person to become VP and his so-called “gaffes” reflect his level of ignorance and arrogance.
I recall him once telling a room full of “journalists” that he was “the smartest person in the room.”
Ok, in THAT particular situation, he may have been right!! But, the rest of the time - let’s just say that there’s a reason that even zero keeps him out of sight as much as possible.