Adjuncts at Trinity Washington University voted to form a union affiliated with Service Employees International Union, they announced Friday. The count was 74 in favor and 54 opposed. SEIU’s Adjunct Action campaign to organize adjuncts across metro areas began in the Washington, D.C., region and the union says 90 percent of the adjuncts in the city -- at five other universities -- are now affiliated with it. A university spokeswoman did not immediately respond to a request for comment.