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At a campaign rally in Grand Rapids, Michigan, former Senator John Edwards will officially endorse Barack Obama. The 2008 Democratic Presidential primary has been a long, grueling and emotional process and both Obama and Clinton have big name endorsements in their corner -- but this one could be the biggest of all. John Edwards ran a solid, progressive, populist campaign and was a favorite of many in the blogosphere. What do you think, does Edwards' endorsement of Obama have any real significance?