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“They’re working under a system where they have contributions in the low thousands — to limit corruption and the appearance of corruption — for campaigns that cost in the millions,” Mr. Doherty said.

The New York Times reported that the Obama campaign has had to schedule even more fundraisers to try to catch up.

Ms. Psaki declined to talk about “internal strategy” and defended the president’s schedule.

“We do feel very comfortable with our ability to balance his role as commander in chief, the time he’s campaigning, and the time that he does need to spend fundraising because it’s a political campaign,” she said.