One of the problems in dementia is called sun downing. Patient is fit and raring to go in the morning but as the day wears on they get worse and worse and it apexes around sundown. A real conspiracy theorist would say the early lids are because they are changing Joes sleep cycle so he is just waking up an hour before the debate on the 29th.
Dems vote early. Republicans vote late. Their lead is not big enough.