This article was reported by William Yardley, Jo Becker, Mike McIntire and David D. Kirkpatrick, and was written by Mr. Yardley.

Her father shot the grizzly bear whose hide is now draped over the sofa in her office. She, too, hunts and fishes. She runs marathons. She delivered her fifth child during her first term as governor. They call her husband, the reigning champion in the annual Iron Dog snowmachine race, First Dude.

Sarah Palin, Senator John McCain’s surprising selection to be his vice-presidential running mate, took Alaska by surprise, too, not long ago. Though indisputably Alaskan, she rose to prominence by bucking the state’s rigid Republican hierarchy, impressing voters more with gumption, warmth and charm than an established record in government.

It was a combination that dumbfounded her rivals.

“She wouldn’t have articulated one coherent policy and people would just be fawning all over her,” said Andrew Halcro, a Republican turned independent, who along with Tony Knowles, a Democrat, ran against Ms. Palin for governor in 2006. “Tony and I looked at each other and it was, like, this isn’t about policy or Alaska issues, this is about people’s most basic instincts: ‘I like you, and you make me feel good.’ ”