The story

Sen. Hillary Clinton's superdelegate lead over Sen. Barack Obama was narrowed even more Saturday, according to CNN's latest delegate estimate.

Obama closed to within one superdelegate of Clinton, picking up the support of four party leaders after a flurry of new endorsements over the past two days. Clinton, meanwhile, picked up the votes of two superdelegates but lost one to Obama.

That brings Clinton's superdelegate total to 273 and Obama's to 272. Read full article »

CNN's Steve Brusk, Mark Preston, Robert Yoon, Rebecca Sinderbrand, Richard Allen Greene, Ed Hornick and Alexander Mooney contributed to this report.

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