Biden tripping was shown on late bbc news, it looked like maybe he'd had one too many celebratory champagnes to me, & then trying to jog up a couple of steps ahead, he also rubbed his knee, so maybe he's got a bit of knee trouble but won't admit it? (I've got knee problems, i can't do steps well either,at only 57!) He also could have been re- repeating just the 'president' bit of 'vice-president Harris' which is expected if he's had a speech impediment, it will be back maybe if he is nervous of giving speeches perhaps? But all in all, he is still way better than Trump, so stop moaning.We have Boris as a leader- so we are no better off than the Americans, and Boris hasn't got old age to use as an excuse!?