The federal trial against Lance Armstrong is scheduled to begin in Washington, D.C., on May 7. The government is claiming Armstrong defrauded the U.S. Postal Service during its sponsorship of Armstrong’s professional cycling team.The U.S. claims Armstrong hid performance-enhancing drug doping by himself and his teammates to cause the U.S. Postal Service to continue the sponsorship, including its $32.3 million in funding.The doping was a violation of the sponsorship contract Armstrong’s team had with the Postal …