An overwhelming majority of delegates are pledged to Mr. Biden, but a growing if still limited number of them are expressing pessimism about the party's chances with him at the top of the ticket.
The Biden campaign has been calling hundreds of convention delegates to confirm their support. Some felt pressured to stay quiet about concerns, fearing exclusion from the convention.
Delegate calls were a part of normal outreach but have intensified post-debate. Despite concerns, Biden campaign reiterated the president's commitment to stay in the race.
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