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WASHINGTON (WUSA9) -- A former chief of staff to former D.C. Mayor Anthony Williams has pleaded guilty to conspiracy in D.C. Superior Court.

Tuesday, Robinson pleaded guilty to conspiring to defraud the District of Columbia's Office of Campaign Finance by receiving and concealing campaign contributions in excess of those permitted under D.C. campaign finance laws. The charge involves contributions to Robinson's 2010 campaigns for At-Large Member of and for the Ward 6 seat on the Council of the District of Columbia.

In his plea, Robinson admitted that about $33,500 was secretly channeled to his campaigns from Jeffrey E. Thompson, the former chairman, chief executive officer, and owner of D.C. Healthcare Systems, Inc. Thompson, who also used to be chairman, CEO and majority owner of Thompson, Cobb, Bazilio and Associates, previously pleaded guilty to charges of making illegal contributions to several federal and District of Columbia campaigns.

Robinson's sentencing has been scheduled for August 13.

The felony charge carries up to 5 years in prison and a $10,000 fine, but in a press release from court officials, he could face less time: "Under the Court's voluntary sentencing guidelines, the parties have agreed that Robinson faces a range of one to 12 months in prison, or, possibly, probation."

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