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There is no legal requirement that candidates release lists of bundlers unless they are also federal lobbyists. But with the exception of Republican nominee Mitt Romney, every major candidate has voluntarily released a list in recent presidential elections. Mr. Romney did release a list in his failed 2008 bid.

“Our major volunteer fundraisers, as well as the ranges of contributions they raised, were previously made public because unlike Governor Romney, we disclose them on our website,” Adam Fetcher, the Obama campaign’s deputy press secretary, said in a statement.

Mrs. Krumholz criticized Mr. Romney’s reversal and said disclosure should be made mandatory, not left to individual campaigns that can decide who or what to post.

“We are wholly dependent on the campaigns to provide this information in a complete and timely way. It should be formalized into the campaign finance disclosure rules,” she said.

Bundlers abroad

The finance VIPs living in foreign countries include Glen Fukushima, chairman of the Japanese division of European aircraft manufacturer Airbus, which has had testy relationships with major defense contractors and political players in the U.S. such as Boeing, and Robert “Skipp” Orr, a former president of Boeing Japan and 2008 bundler who Mr. Obama nominated as ambassador to the Asian Development Bank in 2010.

Also among them are Daniel Crosby, an international trade lawyer in Geneva, and Robert Keane, head of Paris-based Vistaprint, and his wife. Mr. Keane was a member of a committee that hosted a fundraiser in Paris featuring Jim Messina, Mr. Obama’s campaign manager.

Bundlers with controversial ties can be liabilities to a candidate, and Mr. Obama has in some cases stripped names from his list after controversies. Abake Assongba, who runs a nonprofit that ostensibly raises money for Africa, was listed as raising at least $50,000, but disappeared from the roster after she was accused of wire fraud and of using an email scam to steal money that was allegedly used to buy a luxury home.

The campaign also struck the name of Rojas Cardona, a Mexican businessman with Chicago ties, and returned contributions associated with him after it emerged that he was a fugitive and alleged attempted assassin.

Other bundlers

But the majority of the 25 names appear to have uncontroversial and varied backgrounds.

On the lower end of the dollar scale, the group includes Eric and Andrew Dayton, sons of Minnesota Gov. Mark Dayton. The list also includes Jimmy Kuhn, president of brokerage Newmark Knight Frank, who the internal documents said raised $75,000.

Repeat bundlers include Ned Lamont, chairman of telephone company Lamont Digital, who raised $204,730 for the Obama campaign in 2008 and has returned with $102,400 this year, according to the internal documents obtained by the New York Times, but not the public disclosures. He and his wife each gave $35,800 directly.

Disclosures from Mr. Obama’s 2008 campaign show his name, as do 2004 records showing he bundled for the presidential campaign of Sen. John F. Kerry that year.