While overall discomfort with an African-American president is much lower, it rises among less-educated whites - the same group that's been a challenge for Obama in the Democratic primaries. Among whites who haven't gone through college, 17 percent say they'd be at least somewhat uncomfortable with a black president; that compares with just 4 percent of white college graduates. Clinton may face a similar problem, however; less-educated whites also are more apt to be uncomfortable with a woman president (21 percent, vs. 7 percent of white college graduates).

This poll -- like the last ABC News/Washington Post survey -- finds no apparent damage to Obama in the controversy over his former pastor, the Rev. Jeremiah Wright. Six in 10 Americans, and 73 percent of Democrats, say Obama has done "the right amount" to distance himself from Wright, rather than too little or too much.