Multiple times each day, President Biden dials up Mike Donilon, a close adviser since the 1980s, to chew on the latest polls and headlines.

“What’s your instinct? What do you think?” Mr. Biden will ask Mr. Donilon, who recently left the White House for the campaign’s Delaware headquarters.

Once a week, Mr. Biden summons Ron Klain, his former chief of staff, to workshop the best attacks to use against former President Donald J. Trump as the presidential debate draws closer.

When he…

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