Democratic presidential hopeful Sen. Barack Obama, D-Ill., talks with Del. Madeleine Z. Bordallo, D-Guam, in the Capitol, Thursday, May 8, 2008 in Washington. Obama's unannounced visit to the Hill during House votes lasted more than half an hour. He told reporters he's not taking the Democratic presidential nomination for granted, and that he was asking members of Congress to support his White House candidacy. (AP Photo/Susan Walsh)

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