Two Joe Bidens: The night America saw the other one

The past 36 hours showcased two Joe Bidens: the veteran president rallying voters in a swing state, and an 81-year-old man struggling to string thoughts together in a debate.

Why it matters: The public split screen isn't new to many inside the White House, where top aides have meticulously stage-managed minutiae such as Biden's sleep schedule, his orthopedic shoes, his walks to Marine One and his climb aboard Air Force One to try to blunt concerns about his age.