Perhaps most important as the president’s team struggles to put his campaign back on track is a renewed effort to win the three remaining debates, starting with Thursday’s face-off between Vice President Joseph R. Biden Jr. and Representative Paul D. Ryan. Mr. Biden moved into a Delaware hotel on Sunday for three days of debate camp.

Under the tutelage of David Axelrod, the president’s chief strategist who is personally overseeing the preparations, Mr. Biden will be counseled on how to avoid Mr. Obama’s mistakes and even correct them with a more aggressive prosecution of the Republican ticket. Mr. Axelrod’s involvement highlights the stakes the Obama campaign places on the debate, and Mr. Biden has been reading “Young Guns,” the book co-written by Mr. Ryan, and practicing attack lines that Mr. Obama avoided…

The president proved as aggressive in his post-debate rallies as he was passive in the debate, but the campaign was besieged by anxious Democrats. Mr. Messina had to pep up a demoralized staff in Chicago. Mr. Obama took the blame during calls with advisers. “This is on me,” he told them. Asked by some if Mr. Kerry was at fault, Mr. Obama said no. “It wasn’t Kerry,” he sad. “Kerry was fine.”