Flanked by dozens of union members, a group of Colorado Democrats unveiled legislation Tuesday to remove a unique barrier to union organizing in the state. The proposal, which will not be introduced until the legislative session starts in early January, would repeal an 81-year-old requirement that unions in Colorado pass a second election before they can begin negotiating union dues and fees. Colorado is the only state with such a rule, legislators said, and they cast the measure as a way to remove an additional government requirement from union-employer negotiations. Federal law requires new unions to pass one election to form, though some states have so-called “right-to-work” laws that don’t require all employees in a unionized shop to pay dues or be a member of the union that represents them. The Colorado legislation, dubbed the Worker Protection Act, will be backed by Denver Democratic Reps.