Buyer’s remorse. The personal issue is that the Reps have nominated Palin. It does appear that Biden has a drinking problem, but that shouldn’t matter since he is a Dem.
I believe it was Nixon who also had a drinking problem. He had a liquor cabinet in the White House. He gave one of the honor guard the key to the cabinet and told the honor guard that he was under strict orders to allow Nixon to have only one drink a day.