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But he decided later not to enter the public financing system and became the first major-party nominee to forgo the public money and spending limits. He went on to raise about $750 million, more than three times what Republican John McCain could spend.

This year, neither Mr. Obama nor his opponent, Republican Mitt Romney, is accepting public financing. During the race to raise cash through the fall campaign, Mr. Obama has held multiple fundraising events on the same day. On one notable day, Mr. Obama held six fundraisers in about nine hours, flying from Washington on Air Force One to Minneapolis for a triple-header of donor events before flying to Chicago for three more.

Mr. Romney also is keeping an ambitious fundraising schedule, but he is free from the concerns and time demands of a day job.

Among the limited number of other events on the president’s public schedule since the Democratic convention were a meeting at the White House with Myanmar’s opposition leader Aung San Suu Kyi on Sept. 19 and his speech to the U.N. General Assembly on Tuesday.