evidence: In the end, President Joe Biden exited the political stage in isolation. [...] But in the end, the pressure on Biden from party leaders, rank-and-file lawmakers and donors – and the polling showing the perilous and potentially insurmountable path Biden faced amid a growing deficit with Trump – ultimately proved too much. Described as being more isolated than he had ever been, Biden could not withstand the push behind the scenes and in public. The blunt reality became a chorus of voices calling for the president to exit the race, like a boulder rolling down a mountain that only picked up momentum with each passing day. [...] Biden consulted only a very small number of close aides on the decision. Some members of his inner circle were left in the dark until minutes before he posted his announcement on social media, including one of his closest communications advisers, Anita Dunn.