I knew it would backfire on them. Sitting and leaning on one's elbows isn't something that projects strength, vitality and good health. And being stooped over and leaning or slouching at the podium also isn't something that projects stamina.
Actually, I guess slouching isn't the best word to use because Bernie's poor posture is clearly osteoporosis... it's just a fact of life and other than wearing an uncomfortable back brace, there's really not much he can do about it. But still, it cannot be denied that poor posture (for whatever reason) always conveys a visual message that makes people see a person who's not in good health or frail and weak.
But, sadly for him, in comparison to Biden's upright posture and well-fitted suits, Bernie's situation just gives the impression of someone who's tired and not in good health. And on the "world stage" when standing next to other world leaders (both friend and foe) we need someone like Joe Biden to give the impression and send the message that the United States is strong and vital and coming back from our long nightmare.
There are many articles online about posture and health, and how poor posture is a sign of poor health and how it can lead to other problems as well. If anyone doubts me, just do a google search for "posture and health" and look for articles from reputable sources... avoid the ones trying to sell supplements, but stick with the gov't sites, edu sites, webmd and the like. Posture and aging, and posture and pain are also interesting search criteria.