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His plea arrived two days after Gore, a longtime campaign aide to Mr. Gray, pleaded guilty to making donations to Mr. Brown in other people’s names and then destroying a notebook that documented the payments.

Assistant U.S. Attorney Ellen Epstein revealed in court Thursday that Brooks provided Mr. Brown with $2,150 in addition to the $660 outlined during Gore’s court appearance on Tuesday. Mr. Brown devoted $150 of the funds to a Geico insurance payment, court papers said.

Prosecutors said Brooks bought three $500 money orders at a 7-Eleven near his home July 30, 2010, and delivered them blank to Mr. Brown three days later. Mr. Brown deposited one money order into his campaign account and cashed the other two, prosecutors said.

On Aug. 4, 2010, Brooks bought four money orders — two for $500 each for a relative and two, for $500 and $150, that he delivered to Mr. Brown two days later, prosecutors said. Mr. Brown cashed the $500 money order and sent the smaller one to the insurance company, according to charging papers.

In the spring of 2010, Brooks signed the name of a friend on four money orders of $500 that were donated to the Gray campaign and reported under the friend’s name to the D.C. Office of Campaign Finance, prosecutors said.

Prosecutors said he also obtained four money orders from Gore and signed his own name on them as a $2,000 donation to the Gray campaign, even though Brooks had not contributed these funds.

During a voluntary meeting with the FBI, Brooks lied about the source of funds for his donation to the Gray campaign.