Joe Biden suffered another excruciating gaffe while on the campaign trail yesterday as politicians and pundits continue to question the President’s mental acuity. Addressing a rally in Michigan on Friday night, the US President raised further concerns about his ability to lead the country and run for re-election after seemingly confusing two top members of Congress. Trying to reassure the crowd that he was mentally fit following his disastrous debate against Donald Trump and a major gaffe on the world stage in which he confused Ukrainian president Volodymyr Zelensky for Russian President Vladi…