One crucial element of Hanna Pitkin's (1967) definition of political representation has been relatively neglected in the voluminous literature her work has inspired. That element is what I will refer to as potentiality, the subjunctive idea that to be considered represented, citizens must feel that someone would defend their interests if those interests were threatened. Attention to potentiality provides a reason to value descriptive representation. Second, it illuminates the representation provided by nonelected leaders and social groups. Third, it clarifies the reciprocal links between participation and representation: persons who are participatory have better grounds to believe that their interests will be protected, and those who have such a belief participate more. Evidence to support this claimed relationship between participation and representation is presented for the U.S. case.