Judging from her speech before the Republican convention, Sarah Palin is likely to prove an asset to the McCain campaign. She brings to it a strong television style, complete comfort with herself, grit, and an ability to make Republican policies sound like the best possible medicine for ordinary folks.
Her nasty jibes about Obama will free up McCain to look like a statesman. At the same time, she has a "regular folks" demeanor that will doubtless be put to use lampooning Democrats as effete elitists. She'll clearly make a play for disaffected Clinton voters.
Her qualifications to be vice president are still scant, but as a political performer she brings strengths to the campaign.