Why it matters: The popular Georgia Democrat, who at age 45 is 31 years younger than Biden, would bring diversity and excitement to the ticket — showing voters, in the words of a close source, that Biden “isn’t just another old white guy.”

But the decision poses considerable risk, and some advisers are flatly opposed. Some have pointed out that in a Democratic debate, he could be asked why no one on the stage would be a worthy running mate.

Advisers also know that the move would be perceived as a gimmick.