Barack Obama has been privately discussing his doubts about Biden's campaign.
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- Obama has doubts that Biden can win the election, the Washington Post reported.
- Obama has told allies he worries about both donors' and voters' waning support.
- So far, Biden has insisted he's not ducking out of the race, despite growing pressure from Democrats.
President Joe Biden may have lost the support of the man he once served as vice president: Barack Obama.