LOUISVILLE, Ky. — Barack Obama stepped to the brink of victory in the Democratic presidential race Tuesday night, defeating Hillary Rodham Clinton in the Oregon primary and moving within 100 delegates of the total he needs to claim the prize at the party convention this summer.
"You have put us within reach of the Democratic nomination," he told cheering supporters in Iowa, the overwhelmingly white state that launched him, a black, first-term senator from Illinois, on his improbable path to victory...
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