The word "change" is now so overused that it's in danger of sliding past platitude into meaninglessness. But it must be working, because a freshman black senator won 13 out of 22 states last week by selling it-and himself-to a surprisingly broad cross-section of Americans. Will Barack Obama's appeal to independents convince those 796 pivotal Democratic superdelegates that he's got longer coattails than Hillary Clinton and thus the best chance to help expand the party?
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