When questioned about the nuts and bolts of governing, Ms. Palin tended to avoid specifics and instead fell back on her core values: a broadly conservative philosophy and a can-do spirit.

“My attitude and my approaches towards dealing with the complexities of health care issues,” she said in an AARP debate in October 2006, “is a respectful and responsible approach, and it’s a positive approach. I don’t believe that the sky is falling here in Alaska.”

These patterns could help explain why the McCain campaign negotiated for less time for discussion in her debate Thursday with Senator Joseph R. Biden Jr. of Delaware than the presidential candidates had in their debate last week.

Ms. Palin was not always at her best when questioned by her opponents in the governor’s race.

In the AARP debate, Mr. Knowles and Andrew Halcro, an independent, double-teamed her to press her about how she would pay for health care.

In response to Mr. Knowles, she mentioned “certificates of need” and said they had been inflexible, “creating an environment where a lot of folks are lacking the receiving of their health care that is needed in some of the areas, especially in some of our larger markets.” She added, “The State of Alaska needs to be looking specifically at that inflexibility that exists today in order to fill some of the market needs that are out there in Alaska in our larger markets.”

She then added, “I can’t tell you how much that will reduce monetarily our health care costs, but competition makes everyone better, it makes us work harder, it does allow reduction in costs, so addressing that is going to be a priority.”

Mr. Knowles was nonplussed, saying that he did not understand her answer and that Ms. Palin had missed the point.