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Ethics analysts question whether Mrs. Feinstein had an obligation to track her husband’s business dealings with the government to avoid any appearance of a conflict of interest.

“I find it amazing that they did not know that CB Richard Ellis had gotten the FDIC contract,” said Mr. Cooper, the ethics expert and former regulator. “Why wasn’t she or a staff person regularly watching for possible conflicts?”

Other experts said they do not think that the Senate Ethics Committee will take any action because Mrs. Feinstein’s legislation did not directly financially benefit her husband and was aimed at solving a problem affecting a broad section of America.

Robert L. Walker, a former chief Senate Ethics Committee counsel, said the Senate conflict rule is so narrow that it “almost requires a senator’s sponsorship of a private bill resulting in some personal or family benefit before a violation of the rule would be found.”

Mr. Walker added that the Senate usually relies on the senator to police against improper appearances, but the policy “assumes that a senator and his or her staff will know about and remain alert to investments and other financial ties, including family financial ties, that could be the basis of such appearance concerns.”

Mr. Duran said Mrs. Feinstein and Mr. Blum make “an intensive effort” to maintain a wall between their financial interests.

“Her staff carefully reviews all votes,” he said. “Senator Feinstein complies with all required congressional disclosure requirements. She follows the guidance of the ethics committee and its requirements.”

Mrs. Feinstein, who declined to answer detailed question about the steps she takes to avoid conflicts, is one of the wealthiest members of Congress, mainly from Mr. Blum’s holdings. Together, they are worth at least $52.3 million, according to her 2007 personal financial disclosure forms filed with the Senate and analyzed by the nonpartisan Center for Responsive Politics, which monitors money and politics.

“When a spouse has so many business interests, it will always raise questions about how contracts are acquired or decisions made,” said Ms. Sloan, CREW’s executive director.