I know she still sits atop every poll for the Democratic primary, but at some point the value of the number of individual donors Obama continues to string together has got to count for something.
For every donation he gets from a NEW donor (and he now has more individual donors than ALL of the GOP candidates combined, and far more than Clinton) he is enlisting a soldier in the battle. Because many of their gifts (the vast majority) are so far beneath the legal limit - he has the "growing pie" potential where he can continue to go back and build upon the fund raising base again and again.
How Hillary ultimately is able to counter this with IOU's from has-been county chairmen seems a tad impossible, but those who make the argument that she has "the organization" even though he has "the money" seems to be winning out in the daily tracking polls.