Good catch. Probably he got punched by staff for blowing it debate night. There was a picture on this thread a few weeks ago of the back of Biden's hand at some function and there was a small round dark bruise in the middle. The immediate suggestion here was evidence of an IV puncture.
There is little doubt in my mind that Biden and his team cheated in the debate. The method is a mystery for now.
The rosary is traditionally prayed here after supper with family...the prayer is easy for ordinary people, but fell out of favor in the US after Vatican 2.
But I don't know if the bishops pushed prayer in the USA.
As for Biden, it looks like he is showing off...how can a person pray Blessed is the fruit of thy womb and support killing millions of babies in their mother's wombs...