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As part of his lobbying duties last year, Mr. Barr also championed a medical-marijuana amendment and legislation to defund the so-called drug czar’s advertising budget, Mr. Kampia said.

As a congressman, Mr. Barr used his eponymous amendment to block D.C. officials from counting the votes from a November 1998 ballot measure that would have legalized medicinal marijuana.

After a federal judge ordered the ballots counted, voters learned that the measure had been approved by a margin of 69 percent to 31 percent. The U.S. Court of Appeals later reinstated the Barr Amendment, preventing the District from processing any new laws aimed at legalizing medicinal marijuana.