Still, the effects of whites' racial views are apparent in the polling.
Statistical models derived from the poll suggest that Obama's support would be as much as 6 percentage points higher if there were no white racial prejudice.
But in an election without precedent, it's hard to know if such models take into account all the possible factors at play.
The AP-Yahoo News poll used the unique methodology of Knowledge Networks, a Menlo Park, Calif., firm that interviews people online after randomly selecting and screening them over telephone. Numerous studies have shown that people are more likely to report embarrassing behavior and unpopular opinions when answering questions on a computer rather than talking to a stranger.
Other techniques used in the poll included recording people's responses to black or white faces flashed on a computer screen, asking participants to rate how well certain adjectives apply to blacks, measuring whether people believe blacks' troubles are their own fault, and simply asking people how much they like or dislike blacks.
"We still don't like black people," said John Clouse, 57, reflecting the sentiments of his pals gathered at a coffee shop in Somerset, Ohio.
Given a choice of several positive and negative adjectives that might describe blacks, 20 percent of all whites said the word "violent" strongly applied. Among other words, 22 percent agreed with "boastful," 29 percent "complaining," 13 percent "lazy" and 11 percent "irresponsible." When asked about positive adjectives, whites were more likely to stay on the fence than give a strongly positive assessment.
Among white Democrats, one third cited a negative adjective and, of those, 58 percent said they planned to back Obama.
The poll sought to measure latent prejudices among whites by asking about factors contributing to the state of black America. One finding: More than a quarter of white Democrats agree that "if blacks would only try harder, they could be just as well off as whites."
Those who agreed with that statement were much less likely to back Obama than those who didn't.
Among white independents, racial stereotyping is not uncommon. For example, while about 20 percent of independent voters called blacks "intelligent" or "smart," more than one third latched on the adjective "complaining" and 24 percent said blacks were "violent."
Nearly four in 10 white independents agreed that blacks would be better off if they "try harder."
The survey broke ground by incorporating images of black and white faces to measure implicit racial attitudes, or prejudices that are so deeply rooted that people may not realize they have them. That test suggested the incidence of racial prejudice is even higher, with more than half of whites revealing more negative feelings toward blacks than whites.
Researchers used mathematical modeling to sort out the relative impact of a huge swath of variables that might have an impact on people's votes — including race, ideology, party identification, the hunger for change and the sentiments of Sen. Hillary Rodham Clinton's backers.
Just 59 percent of her white Democratic supporters said they wanted Obama to be president. Nearly 17 percent of Clinton's white backers plan to vote for McCain.
Among white Democrats, Clinton supporters were nearly twice as likely as Obama backers to say at least one negative adjective described blacks well, a finding that suggests many of her supporters in the primaries — particularly whites with high school education or less — were motivated in part by racial attitudes.
The survey of 2,227 adults was conducted Aug. 27 to Sept. 5. It has a margin of sampling error of plus or minus 2.1 percentage points.
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Associated Press writers Nancy Benac, Julie Carr Smyth, Philip Elliot, Julie Pace and Sonya Ross contributed to this story.
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