Obama narrows Clinton's superdelegate lead to one

WASHINGTON (CNN) - Sen. Hillary Clinton's superdelegate lead over Sen. Barack Obama in the quest for the Democratic presidential nomination continued to shrink on Saturday, according to CNN's latest delegate estimate.

Obama closed to within one superdelegate of Clinton, picking up the support of another 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.

At the beginning of the year, Clinton led the superdelegate race by more than 100.

Superdelegates are Democratic officials who hold the balance of power in determining the party's presidential nominee.

Obama holds a commanding lead in the number of pledged delegates awarded from primaries and caucuses - 1,592 to Clinton's 1,424.