Sarah Palin Boom Busts: Poll Casts Doubt on Experience Prior to Vice Presidential Debate

Skepticism about Sarah Palin has soared since she entered the national political stage, with six in 10 Americans now doubting her qualifications for office and fewer than half convinced of her grasp of complex issues.

Expectations game begins in earnest as Sen. Joe Biden and Gov. Sarah Palin head to Thursday's vice presidential debate.

(ABC News)

In advance of her debate against Joe Biden on Thursday, Palin now looks more like a drag than a boost to the GOP ticket: Thirty-two percent of registered voters say her selection makes them less likely to support John McCain for president, up from 19 percent last month.

Click here for a PDF with charts and full questionnaire.

Her basic ratings are weaker still.

Just 35 percent say Palin has the experience it takes to serve effectively as president, down a dozen points since early September; 60 percent think not, up 15. And just 46 percent think Palin "understands complex issues," while 49 percent think she doesn't -- a poor assessment on this most basic qualification.

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Biden's ratings starkly contrast Palin's: Seventy-five percent say he understands complex issues, 70 percent say he has suitable experience to take over as president if necessary and just 13 percent say his selection makes them less apt to support Barack Obama.

In the most fundamental measure of a public figure's popularity, 51 percent now express an overall favorable opinion of Palin, down from 58 percent Sept. 7, just after the GOP convention.

While she's lost 7 points on this score, Biden's moved the other way, gaining 6 points -- 57 percent see him favorably, up from 51 percent.

VP Debate Marks Opportunity for Palin

Thursday's debate marks an opportunity for Palin to address these concerns, but also carries the risk of cementing them in the public's mind.

The hazard she faces is that it's generally easier to confirm preconceptions than to change them.

Palin does have one better rating, for her common touch: Fifty-eight percent of registered voters think she understands the problems of people like them. But as many, 57 percent, say the same of Biden.