"While Clinton was viewed as having an institutional advantage in amassing superdelegates by virtue of her fifteen years of national prominence in party politics, Obama had heavily outspent Clinton in previous contributions to superdelegates through their political action committees.Speculation that Barack Obama had amassed about fifty additional superdelegates, removing Clinton's final advantage in the race, was reported on the eve of the March 4 primaries and caucuses; with the Clinton victory in most of that night's contests, the Obama camp chose not to release those names as expected the next day.