This has been obscured because most media outlets have included superdelegates in their counts, but Obama has been the leader in pledged delegates from Day 1 in Iowa, and there has never been a day of voting in which Hillary won more delegates.
Jan 3: Iowa Obama 16, Clinton 15
Jan 8: NH Obama 9, Clinton 9
Jan 19: Nevada Obama 13, Clinton 12
Jan 26: SC Obama 25, Clinton 12
Feb 5: 22 states: various counts, but all had Obama winning more; msnbc: Obama 861 Clinton 855; wikipedia Obama 847 Clinton 834; (feel free to add up the CNN results)
Feb 9: Obama sweeps 4 contests
Feb 10: Maine Obama 15 Clinton 9
FEb 12: Obama sweeps 3 contests
http://www.cnn.com/ELECTION/2008/primaries/results/scorecard/#Dhttp://en.wikipedia.org/wiki/Super_TuesdayFor those hoping the superdelegates will overturn the will of the voters, it won't happen. Of the 796 supers, only about 300 have committed publicly. The other 500 have not committed because they are waiting for a clear winner to emerge from the voters and then they will commit. The supers will start moving to Obama. They will not destroy the Democratic party by overthrowing the voters in this historic contest.
The supers have helped Hillary a lot only because the media has been including them, so much of the public has been misled into thinking Hillary has been consistently leading, when it is Obama who has been the leader since Iowa. It's only very recently that much of the public has been come aware of the concept of superdelegates, and now some media outlets have begun dividing their delegate count into pledged and supers.