NY Times/CBS Polling

Times/CBS News poll suggested that Ms. Palin’s selection has, to date, helped Mr. McCain only among Republican base voters; there was no evidence of significantly increased support for him among women in general. White women were evenly divided between Mr. McCain and Mr. Obama; before the conventions, Mr. McCain led Mr. Obama among white women, 44 percent to 37 percent.

By contrast, at this point in the 2004 campaign, President Bush was leading Senator John Kerry of Massachusetts, the Democratic challenger, by 56 percent to 37 percent among white women.

Among other groups, Mr. Obama had a slight edge among independents, and a 16-percentage-point lead among voters ages 18 to 44. Mr. McCain was leading by 17 points among white men and by the same margin among voters 65 and over. Before the convention, voters 65 and older were closely divided. In the latest poll, middle-age voters, 45 to 64, were almost evenly divided between the two.

The latest Times/CBS News nationwide telephone poll was taken Friday through Tuesday with 1,133 adults, including 1,004 registered voters. The margin of sampling error is plus or minus three percentage points for all respondents and for registered voters.

The poll was taken during a period of extraordinary turmoil on Wall Street. By overwhelming numbers, Americans said the economy was the top issue affecting their vote decision, and they continued to express deep pessimism about the nation’s economic future. They continued to express greater confidence in Mr. Obama’s ability to manage the economy, even as Mr. McCain has aggressively sought to raise doubts about it.

This poll found evidence of concern about Ms. Palin’s qualifications to be president, particularly compared with Senator Joseph R. Biden Jr. of Delaware, Mr. Obama’s running mate. More than 6 in 10 said they would be concerned if Mr. McCain could not finish his term and Ms. Palin had to take over. In contrast, two-thirds of voters surveyed said Mr. Biden would be qualified to take over for Mr. Obama, a figure that cut across party lines.

And 75 percent said they thought Mr. McCain had picked Ms. Palin more to help him win the election than because he thought that she was well qualified to be president; by contrast, 31 percent said they thought that Mr. Obama had picked Mr. Biden more to help him win the election, while 57 percent said it was because he thought Mr. Biden was well qualified for the job.

This poll was taken right after Ms. Palin sat down for a series of high-profile interviews with Charles Gibson on ABC News.

Over the last two weeks, Mr. McCain has increasingly tried to distance himself from his party and President Bush, running as an outsider against Washington. The poll suggested the urgency of Mr. McCain’s task: The percentage of Americans who disapprove of the way Mr. Bush is conducting his job, 68 percent, was as high as it has been for any sitting president in the history of New York Times polling. And 81 percent said the country was heading in the wrong direction.