This article focuses on the actions developed by two categories of professionals—French sign language interpreters and social workers in care institutions—to address the difficulties met by deaf people and people with intellectual disabilities in exercising their right to vote during the French presidential election campaign of 2017. After showing the conditions in which these professionals formed their respective sets of actions, we propose an analysis of the forms of political mediation implemented by these professionals, and their effects on the definition of electoral citizenship given to their recipients.