ANCHORAGE — When she appeared for a candidate's forum in front of a room filled with unionized Alaskan electrical workers during her run for governor in early October 2006, Sarah Palin was woefully unprepared. When the union members grilled her on labor policy, Palin faltered.
Afterward, a furious Palin cursed in anger and berated her staff, recalled two former senior campaign aides who blamed her unwillingness to bone up on workplace issues for the blunder.
But just a few weeks later, when Palin jousted with her two main rivals during critical pre-election debates, she was much more at ease. She distilled policy questions into simple answers and countered her opponents' attacks with verbal thrusts delivered with a sunny smile.
When one moderator asked what she would do if one of her unmarried daughters became pregnant, Palin had a ready answer, defending her antiabortion stance and deflecting the question toward her male rivals: "I would choose life. And I am confident you will be asking my opponents these same scenarios?"
During Palin's brief exposure to the high-stakes environment of political debates, she has unnerved both her handlers and her opponents. At times she has been handicapped by her lax approach to learning the nuances of policy and state issues, but she has also projected a Reaganesque ability to offer up pithy answers and charm on camera.
"The political landscape here is littered with people who have underestimated Sarah Palin," said Eric Croft, a former state representative who ran for the Democratic nomination for governor in 2006 and appeared with Palin during several early forums.
Palin's split-personality debate persona -- mirrored in her confident speech to the Republican convention in Minneapolis in early September and in a series of wobbly performances in recent television interviews -- poses a challenge for her Democratic opponent, Delaware Sen. Joe Biden, as Thursday's nationally telecast vice presidential debate in St. Louis approaches.
Biden could face trouble, Alaskan political observers said, if he takes Palin too lightly. But he also has to take care not to be overly aggressive against a candidate who radiates telegenic appeal.
"She has a Reagan-like ability to win over audiences. But for someone who cares about issues and facts, it was rather startling to see her gloss over important questions," said Andrew Halcro, an Alaska businessman who ran as an independent candidate for governor against Palin.
Biden, the garrulous Senate Foreign Relations Committee chairman, is also at ease on camera and often showed his command of foreign policy issues and his flashing wit during a string of Democratic Party presidential primary debates in 2007.
But he has stumbled before. A debate gaffe ended his presidential hopes in August 1987, when he used an anecdote about a family hampered by lack of economic opportunity -- without crediting the source, British Labor Party leader Neil Kinnock.
For its part, Sen. John McCain's campaign appears to be taking no chances that Palin will prepare properly. It flew her Monday to McCain's Arizona ranch to cram with a coterie of the GOP presidential candidate's advisors.
As she began her run for governor of Alaska, Palin repeatedly proved difficult to prep for a debate, recalled her two former political aides, who had pivotal roles during her campaign but declined to be identified because of their continuing involvement in Alaska politics.
Palin, the former aides said, had a sharply limited attention span for absorbing the facts and policy angles required for all-topics debate preparation. Staffers were rarely able to get her to sit for more than half an hour of background work at a time before her concentration waned, hindered by cellphone calls and family affairs. "We were always fighting for her attention," said one of the aides.
In mid-October 2006, Palin's staffers saw their worries justified in the first political forum of the campaign season, an event at Anchorage's 49 Supper Club, where candidates unveiled their stump speeches before a room filled with political players. The former Wasilla mayor breezed through an upbeat speech about "taking back Alaska" but struggled during a question-and-answer session.
"To her credit, she gave a lot of 'I don't knows,' " one former aide recalled. "But it was clear she didn't start out with a great range of knowledge about Alaskan affairs."
In the weeks that followed, Palin's senior campaign aides took care not to let her repeat the dismal performance. "I was always frustrated because 30 minutes before game time, I'd want to say, 'Let's turn off the phone and lock the door. And please calm down,' " one of her former aides said.