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“I am confident that prosecutors will push hard to ensure that all wrongdoers are brought to justice,” she said.

Council member Tommy Wells, Ward 6 Democrat and also a candidate for mayor, said in a statement that “justice is prevailing” in Thompson’s admissions of his crimes.

Mr. Wells has long boasted that he was one of the few elected leaders in the city left untainted by Thompson’s largesse.

The 10-page charging document filed in the case spelled out how Thompson, who ran a high-powered D.C. accounting firm and whose health care company became the city’s biggest Medicaid contractor, gave $883,750 in illegal campaign contributions to a lengthy list of candidates for federal office — hiding the true source of the funds by transferring the money through straw donors and funding off-the-books campaigns.

Among the campaigns Thompson supported was Mrs. Clinton’s 2008 presidential bid, on which he spent $608,750 for an off-the-books get-out-the-vote effort the campaign has said it was not aware of.

Prosecutors said that, in total, Thompson made more than $3.3 million in illegal contributions to at least 28 political candidates and their campaigns from 2006 to 2011.

The court documents state that Thompson used his accounting firm, Thompson, Cobb, Bazilio and Associates, and his health care business to distribute money to his chosen candidates.

In addition to funding the 2010 mayor’s race, prosecutors said, Thompson secretly provided $278,000 to a candidate running for D.C. mayor in 2006 and lesser amounts to a candidate for the D.C. Council’s Ward 4 seat in 2007, to two at-large candidates running in 2008, to a Ward 6 candidate in 2010, to a Ward 1 candidate in 2010, and to an at-large candidate in 2011.

In February, prosecutors amended the plea agreement for former D.C. Council member Michael Brown to indicate that he admitted to accepting $100,000 in secret donations for his 2008 campaign for the at-large seat. Brown is facing more than three years in prison for accepting $55,000 in bribes from undercover federal agents.

Prosecutors said Thompson also paid Brown $200,000 to withdraw from the 2006 mayoral race.

Thompson faces two years in prison. If he cooperates fully with prosecutors, one count against him could be dismissed, meaning he could face a maximum six months in prison or even be sentenced to probation.