Democratic Presidential candidate U.S. Sen. Barack Obama speaks at the Service Employees International Union conference in Washington on September 17, 2007. (UPI Photo/Yuri Gripas)
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U.S. Senator and Democratic Presidential candidate Barack Obama (D-IL) speaks at the AFL-CIO Building and Construction Trades Presidential Candidate Forum in Washington March 28, 2007. (UPI Photo/Yuri Gripas)
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Supporters cheer for Democratic presidential candidate Sen. Barack Obama (D-IL) during a campaign rally at the Fort Worth Convention Center in Fort Worth, Texas February 28, 2008. More than 11,000 people attended the event, his third of the day. Obama and Sen. Hillary Clinton (D-NY) are locked in a tight race headed into the Texas primary election on March 4, 2008. (UPI Photo/Ian Halperin)
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U.S. Democratic presidential candidates Senator Barack Obama (D-IL) and Senator Hillary Clinton (D-NY) share a hug and talk at the conclusion of the CNN/Los Angeles Times Democratic presidential debate in the Hollywood section of Los Angeles on January 31, 2008. (UPI Photo/Jim Ruymen)
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Barack Obama (L) smiles as he receives presidential endorsements from Sen. Edward Kennedy, Rep. Patrick Kennedy (Rear,L) and Caroline Kennedy(R,R), daughter of the late President John Kennedy, at a rally at American University in Washington on January 28, 2008. Ted Kennedy's endorsement as sought by all three of the Democratic presidential contenders. (UPI Photo/Pat Benic)
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Sen. Barack Obama (D-Ill.) points to the crowd after speaking at a forum of Democratic Presidential candidates hosted by the American Association for Justice at their 2007 Annual Convention in Chicago on Sunday, July 15, 2007. (UPI Photo/Brian Kersey)
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Sen. Barack Obama, D-IL, pictured in a January 5, 2007 file photo departing the White House in Washington, announced his plans to run in the 2008 presidential election on January 16, 2007 (UPI Photo/Roger L. Wollenberg/FILES)
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