EXCLUSIVE: By a vote of 43-20, employees of Deluxe Technicolor Digital Cinema tonight voted to join IATSE and its postproduction local the Motion Picture Editors Guild. This comes a year after postproduction technicians and artists at Deluxe's Culver City unit on the Sony lot overwhelmingly jumped into the union game. The election was overseen by the National Labor Relations Board. This particular further unionization of Deluxe employees comes after what sources tell me…