*it's customary of whatever party is in the white house to wait for the last night of the convention for their sitting president to introduce and pass the baton to their hopeful successor......in the case if Biden they just wanted to throw him a bone cuz they had to. Get it out of the way on The first NIGHT AS LATE AS POSSIBLE when half their lemmings were asleep or watching old will n grace reruns...in hopes people will forget the travesty of his presidency and disassociate him from Kamala.