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“I think that everyone would like to know the basis on which he sustains his financial relationship to Bain once he stopped providing services,” Mr. Bauer said during the conference call.

Over the last two months since Mr. Romney secured the Republican nomination for president, the Obama campaign tried to saddle Mr. Romney with Bain’s role in shuttering manufacturing plants and laying off workers in some of the companies it owned.

Despite harsh criticism from workers who lost their jobs, Republican supporters and several leading Democrats have given the company credit for other successful investments that have helped businesses expand and hire workers.

The Associated Press reported Thursday that Mr. Romney’s financial ties to Bain are unlikely to end any time soon. Just last week, Mr. Romney disclosed more than $2 million in new income from Bain and taxation experts say the payments raise the very real possibility that Mr. Romney could continue receiving income from his former company over the next several years.

Although nowhere near Mr. Romney’s personal fortune, Mr. Obama’s book sales have made him a millionaire worth between $2 and $7 million, according to his latest annual financial disclosure report.

When he arrived in the Senate in 2005, Mr. Obama set up a blind trust but when he received a prospectus from one of the investment companies, he realized that the trust was not sufficient to protect him against even the perception of a conflict of interest, according to a campaign spokesman.

Mr. Obama then sold the stocks, closed out the trust and placed his holdings in U.S. Treasury notes and bills.