Elias Theodorou, a charismatic mixed martial artist who campaigned successfully for the right to use medical marijuana as an athlete, has died. He was 34. His publicist, Jess Moran, confirmed the former UFC fighter died Sunday in Toronto of liver cancer. Theodorou, from Mississauga, Ontario, was an athlete, actor, model, stuntman, dancer, TV pitchman, Harlequin…