The Washington Post:
"Obama’s strategy has concentrated on two ends of the spectrum — very large and very small donors. Through an agreement with the DNC, he has started raising $35,800 from a person or $71,600 from a couple. His appeal to small donors — giving in amounts less than $200 — brought in $21.7 million last quarter.
Bush never created a similar “joint fundraising committee” with the RNC that would have allowed him to capture mega-donors. He stuck with the $2,000 maximum allowed for his primary campaign and relied on public funds for the general-election period from the nominating convention until Election Day."