In his debate against Donald Trump, Biden often looked lost or slack-jawed, and delivered meandering answers in a hoarse voice.
Other Biden aides, donors, and senior Democrats were deeply shaken, as Trump and other crowing Republicans questioned his fitness for office.
Biden's limitations are more familiar inside the White House. The time of day determines the presence of either an engaged or fatigued Biden.
From 10 am to 4 pm, Biden is reliably engaged, while outside this time frame or during international travel, he is prone to verbal miscues and fatigue.
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