Mr. Obama's joint money-raising committee, which can take in checks of more than $30,000 that are divided between the campaign and the D.N.C., collected $69 million in September.
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Half of Mr. Obama's money in June came in checks of less than $200.
At a luncheon at the Providence Biltmore Hotel, aides said he raised $1 million from 800 people in checks of $500 to $2,000.
Since March 1999, Governor Bush has raised $93.2 million in checks of $1,000 or less, much of it raised by a network of fund-raisers called the Pioneers.
Each party solicits such money, often in checks of $100,000 or more, from labor unions, corporations, trade associations, trial lawyers and wealthy individuals.
Soft-money donations are given to political parties, often collected in checks of $100,000 or more and are used to finance television advertisements attacking Congressional or presidential candidates.
All told, about 58 percent of Mr. Obama's total fund-raising during the election has come in checks of less than $200, compared with about 38 percent in 2008.
He raised over twice as much money as Mr. Romney in checks of under $200, which donors can give repeatedly without quickly hitting federal contribution limits.
Passed by Congress this spring, the McCain-Feingold campaign-finance law is intended to eliminate the large donations of soft money, often in checks of $100,000 or more, which have become common in recent years.
