Barack Obama's problem winning votes from working-class whites is showing no sign of going away, and their impression of him is getting worse.
Those are ominous signals as he hopes for strong performances in the coming week in Indiana and North Carolina primaries that would derail the candidacy of Hillary Rodham Clinton, his rival for the Democratic presidential nomination. Those contests come as his candidacy has been rocked by renewed attention to his volatile former pastor, the Rev. Jeremiah Wright, and by his defeat in last month's Pennsylvania primary.
In an Associated Press-Yahoo News poll in April, 53 percent of whites who have not completed college viewed Obama unfavorably, up a dozen percentage points from November. During that period, the numbers viewing Clinton and Republican candidate John McCain negatively have stayed about even.