The former president remains the most trusted member of his party and is uniquely situated to deliver the bad news to his vice president. In fact, it won’t be a total surprise given that Obama never endorsed Biden, despite making it clear he did not want Sanders, the only other choice, to be the nominee.
Obama could pitch withdrawal as a final public service to country and party. For all we know, members of Biden’s family share the idea and would welcome Obama’s intervention.
The timing is tricky because the remaining primary schedule is in flux, leaving Biden about 800 delegates short of the required majority of 1,991. It is even possible the July convention will be postponed or canceled, creating huge complications around the nomination.
And moving Biden aside makes sense only if there are better alternatives. By my count, there are three.