[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2008/POLITICS/09/22/race.politics/art.obama.afp.gi.jpg caption="A poll finds a small percentage of voters said they may turn away from Sen. Barack Obama because of his race."]
(CNN) - A new study that surveyed racial attitudes suggests that racial prejudices could tip the balance in the coming presidential election.
If there were no racial prejudice among voters, Sen. Barack Obama would receive about 6 percentage points more support, according to an AP-Yahoo News poll, designed in partnership with Stanford University.
The results suggest that 40 percent of white Americans hold at least a partly negative view toward blacks, including more than a third of white Democrats and independents. A small percentage of voters - 2.5 percent of those surveyed - said they may turn away from Obama because of his race.
Though Obama is of mixed race - his mother was white, his father black - he is generally identified as black.