LAS VEGAS--(BUSINESS WIRE)--Harrah's Entertainment, Inc. today announced that seasoned officials Jack Effel and Robert Daily will serve as Tournament Director and Event Director, respectively, at the 2007 World Series of Poker.As tournament director, Effel will oversee a wide variety of tournament operations, including dealer and floor-person staffing, tournament rules, payout percentages, structures for mega- and super-satellites, and second chance tournaments. Daily's event director duties wil

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