"He can't keep his mouth shut," Wolffe quotes a "senior Obama aide" as saying of the gaffe-prone Biden in "Renegade: The Making of a President," set for release June 2.
As evidence, Wolffe reports that during the presidential transition period, Biden insulted Valerie Jarrett, one of Obama's closest friends and confidantes. Jarrett had been considered Obama's top choice to fill his vacated Senate seat in Illinois, but took herself out of the running just hours after Illinois Gov. Rod Blagojevich allegedly told a wiretapped conference call he would not heed any Obama recommendation without a payoff.
"Soon after Jarrett pulled out of consideration for the Senate seat, the senior transition team met to discuss Cabinet picks," Wolffe writes.
"Biden tried to compliment Jarrett after one contribution. 'You should be in the Senate,' he quipped. After the meeting, as everyone returned to their offices, Obama stopped Biden to warn him not to say anything like that again. 'It's not funny,' he told him."