Joe Biden is thought to be furious at Barack Obama after media reports that the ex-President wants his former running mate to step aside. Self-isolating due to Covid, the 46th US President is said to be angry at the way he has been treated by his allies. A growing number of Democrat voices have urged the 81-year-old to withdraw from November’s Presidential race in order for a new Democrat candidate to be put forward. Biden has repeatedly shrugged off concerns about his age and cognitive ability, but an increasing number of influential figures are intervening to call on him to rethink his re-el…