They insisted that she needed time to be briefed on national and international issues and on McCain's record.

"Her lack of fundamental understanding of some key issues was dramatic," said another McCain source with direct knowledge of the process to prepare Palin after she was picked. The source said it was probably the "hardest" to get her "up to speed than any candidate in history."

Schmitt came to the back of the plane Saturday to deliver a statement to traveling reporters: "Unnamed sources with their own agenda will say what they want, but from Gov. Palin down, we have one agenda, and that's to win on Election Day."

Yet another senior McCain adviser lamented the public recriminations.

"This is what happens with a campaign that's behind; it brings out the worst in people, finger-pointing and scapegoating," this senior adviser said.

This adviser also decried the double standard, noting that Democratic nominee Sen. Barack Obama's running mate, Sen. Joe Biden, has gone off the reservation as well, most recently by telling donors at a fundraiser that America's enemies will try to "test" Obama.

Several McCain advisers have suggested to CNN that they have become increasingly frustrated with what one aide described as Palin "going rogue."

A Palin associate, however, said the candidate is simply trying to "bust free" of what she believes was a damaging and mismanaged roll-out.