Clinton, Obama battle in Indiana, North Carolina primaries

To a large extent, the gasoline tax eclipsed the controversy surrounding Obama's former pastor. After saying several weeks earlier he could not disown the Rev. Jeremiah Wright for his fiery sermons, Obama did precisely that when the minister embarked on a media tour.

At a news conference in North Carolina last week, he equated Wright's comments with "giving comfort to those who prey on hate."

The balance of the primary schedule includes West Virginia, with 28 delegates on May 13; Oregon with 52 and Kentucky with 51 a week later; Puerto Rico with 55 delegates on June 1; and Montana with 16 and South Dakota with 15 on June 3.

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David Espo reported from Washington. Associated Press Writer Tom Raum contributed to this report from Indianapolis.