This is one video that tells more than the White House ever wanted.
When President Joe Biden wound up a virtual economic forum in Washington on Tuesday, he gave Americans and the world a look at the reality of his final few months in office.
For a full minute, Biden smirked and dawdled as the White House press corps shouted questions about pressing issues facing the country — until he was led off by his handlers, looking for all the world like a dementia p …