Jim Messina, the campaign manager of President Obama's reelection effort in 2012, flatly denied that "anyone who mattered" considered dropping Vice President Biden to add Secretary of State Hillary ClintonHillary Diane Rodham ClintonWoman behind pro-Trump Facebook page denies being influenced by Russians Trump: CNN, MSNBC 'got scammed' into covering Russian-organized rally Pennsylvania Democrats set to win big with new district map MORE to the ticket.



Messina's denial came after journalists Mark Halperin and John Heilemann reported in their new book Double Down that then-White House chief of staff Bill Daley, spooked by the president’s drooping poll numbers in the fall of 2011, ordered campaign staffers to poll and focus-group the impact of switching the two.

Earlier Friday, White House press secretary Jay Carney said he didn't know if President Obama was aware of Daley's efforts, but that the idea was never seriously considered.

"The president never considered that, and had anyone brought that idea to him, he would have laughed it out of the room," Carney said.

Carney, who previously worked as a spokesman for Biden, also offered a defense of the vice president.

"If you look back at 2012, and you look at that moment in the campaign when the vice president had his debate, it was a key moment, and Joe BidenJoseph (Joe) Robinette BidenDems ponder gender politics of 2020 nominee Trump: Why didn't Obama 'do something about Russian meddling?' 2020 Dem contenders travel to key primary states MORE delivered for the ticket," Carney said. "I think there's no question about that, and the president knew he would."