By City AM reporter US President Joe Biden’s efforts to revive his re-election bid and win over sceptical Democrats have done little to soften the push for him to exit the 2024 race, despite a week of campaigning and his own insistence that he is the best candidate to confront Donald Trump. Mr Biden has weighty options before him this weekend that could set the direction of America and his party as the nation heads toward the November election against an energised Republican party which has officially nominated Mr Trump as its candidate for the White House. Almost 35 Democrats in US congress s…