By JEFF ZELENY and ADAM NAGOURNEY

A week before two key primaries, the controversy surrounding his ex-pastor again erupted into a threat to Barack Obama’s ability to show that he could unify the Democratic Party.

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QUOTATION OF THE DAY

"I find these comments appalling. It contradicts everything that I’m about and who I am."

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BARACK OBAMA, on remarks by his former pastor, the Rev. Jeremiah A. Wright Jr.