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Nonetheless, new reports are turning up the heat on Mr. Gray to divulge what he knew about the conspiracy that injected more than a half-million dollars into his campaign without reporting it to the D.C. Office of Campaign Finance.

Mr. Gray has known for months that members of his campaign spent money on his behalf without reporting it during his 2010 race, according to a report Thursday in The Washington Post.

The newspaper quoted sources as saying Jeanne C. Harris discussed the expenditures with Mr. Gray during a Jan. 10 meeting. The report quoted a source as saying Mr. Gray did not learn of the shadow effort until that month.

The Associated Press reported the Gray campaign paid day laborers $100 in cash to work at the polls, exceeding the lawful limits for cash payments while mislabeling the expenditures in campaign-finance reports as consulting fees.

Mr. Gray said he had not read the stories and could not comment on their contents because of the ongoing investigation. The “shadow campaign” was confirmed in open court on Tuesday, when Harris pleaded guilty to conspiracy and obstruction of justice for handling unlawful campaign payments and straw donations on behalf of a conspirator widely thought to be Jeffrey E. Thompson.

Mr. Thompson, who has not been charged with any crimes, held contracts with the city through his accounting firm and a lucrative managed-care deal through D.C. Chartered Health.

A receptionist at the accounting firm referred to the company as “Bazilio Cobb Associates” when she picked up the phone on Thursday, dropping Mr. Thompson’s name from the firm’s title. A spokeswoman for the company confirmed that Mr. Thompson had sold his share of ownership to another partner in the firm.

The recent turmoil does little to help the District’s efforts to gain budget autonomy and full voting rights in Congress. But if the city’s federal overseers on Capitol Hill are worried about recent developments, they are not jumping at the chance to criticize city leadership.

A spokesman for Rep. Trey Gowdy, South Carolina Republican, who has oversight of D.C. affairs, said the congressman “cannot comment on law enforcement investigations or prosecutions.”

Asked about the political implications and effect on D.C. voting rights, he added: “You should reach out to Rep. Holmes Norton’s office about politics in D.C. Rep. Gowdy is not interested in commenting on it.”