“In recent conversations with aides, family members and allies outside the White House, President Joe Biden has vacillated between acceptance and defiance in the face of the seismic shift in his political standing within his own party,“ NBC News reports. “In some discussions, Biden has acknowledged that the blowback from his debate performance last week may grow too large to overcome, while in others he’s been completely dismissive of any notion that he might walk away from his re-election campaign.”