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Among those giving money orders to Mr. Orange on March 10, 2011, were Kwame Calhoun, a California company called Ten2One Entertainment, which has not returned messages, and Mr. Thompson’s Euclid Street Partners. Several employees of Thompson Cobb Bazilio & Associates also donated by check for the maximum amount that day.

The ties of other donors to Mr. Orange that day are harder to figure and include a concierge in Miami Beach, Fla., a Las Vegas consultant and a programmer for the children’s cable channel Nickelodeon, all of whom gave $1,000.

Mr. Orange’s office did not respond to a phone message Monday.

Other politicians who received significant money order donations include former Ward 1 D.C. Council candidate Jeff Smith, former Ward 5 council member Harry Thomas Jr., and council member Michael A. Brown, at-large independent, all of whom received more than $10,000 each. Mr. Fenty received 11 money orders for $3,820.