Most Americans expressed anti-Hispanic sentiments, too. In an AP survey done in 2011, 52 percent of non-Hispanic whites expressed anti-Hispanic attitudes. That figure rose to 57 percent in the implicit test. The survey on Hispanics had no past data for comparison.
The AP surveys were conducted with researchers from Stanford University, the University of Michigan and NORC at the University of Chicago.
Experts on race said they were not surprised by the findings.
"We have this false idea that there is uniformity in progress and that things change in one big step. That is not the way history has worked," said Jelani Cobb, professor of history and director of the Institute for African-American Studies at the University of Connecticut. "When we've seen progress, we've also seen backlash."
Obama has tread cautiously on the subject of race, but many African-Americans have talked openly about perceived antagonism toward them since Obama took office. As evidence, they point to events involving police brutality or cite bumper stickers, cartoons and protest posters that mock the president as a lion or a monkey, or lynch him in effigy.
"Part of it is growing polarization within American society," said Fredrick Harris, director of the Institute for Research in African-American Studies at Columbia University. "The last Democrat in the White House said we had to have a national discussion about race. There's been total silence around issues of race with this president. But, as you see, whether there is silence, or an elevation of the discussion of race, you still have polarization. It will take more generations, I suspect, before we eliminate these deep feelings."