The point is that Beck actually gave Union members prior restraint over paying their dues without the threat of losing membership. Beck stated that 79% of his dues were being used for support of the DNC and won the right to withhold 79% of his dues until the situation was corrected to his satisfaction. That has more direct impact than on the union than after the fact authorization.
As I understand it, paycheck protection would come PRIOR to the authorization. The union leaders would have to get permission from each individual member BEFORE they spend the money.