this opinion sets forth the factual and procedural background. In part II, we determine that the district court did not abuse its discretion in making certain evidentiary rulings and find that there was sufficient evidence for a reasonable jury to convict Ellisor on all counts. Part III disposes of Ellisor's claims of sentencing error. Part IV concludes.

I.

A.
In August 2003, David Lee Ellisor approached Michael Schott, the owner of Party Caterers, to offer his company the sole concession rights to a show called "Christmas From Around the World" (the "Christmas show") in exchange for an up-front payment of $1,400. According to Ellisor, the show was sponsored by the University of Miami art department and would feature Christmas gifts and display pieces brought by attending diplomats. Party Caterer's concession rightsassembling and mailing out invitations for the show.
In September 2003, Ellisor began mailing the invitation materials to teachers at public and private schools in Miami-Dade County, urging them to take their students on "an amazing field trip" to see the Christmas show. The invitation materials indicated that the show was sponsored by *1260 the University of Miami art department and included an April 10, 2003 letter from Walt Hines, a part-time lecturer in the University of Miami art department, purportedly confirming the university's sponsorship of the show. Hines's mailbox at the university was listed as the return mailing address. The materials also claimed that the show was presented by the International Diplomatic Corps of Washington, D.C. (of which Ellisor was identified as an Ambassador-at-Large and diplomatic liaison), as