During the lunch, Obama noted the success of his reelection campaign structure in 2012, when some of his top presidential aides, including David Axelrod and Jim Messina, left the White House to take charge of the reelection operation in Chicago. That is a sharp contrast from Biden’s approach of leaving his closest aides at the White House even though they are involved in all the key decisions made by the campaign . . . Obama also recommended that Biden seek counsel from Obama’s own former campaign aides, which Biden officials say they have done, the people said.