Three central themes that have persisted throughout the history of research on communication and public opinion are examined in light of past, present, and future research. These themes include (1) ongoing concerns surrounding the political diversity of the communication environment; (2) selective exposure to political communication; and (3) the interrelationship between mass and interpersonal political communication. We explore the importance of these themes with an emphasis on how technological changes have made them, if anything, more relevant today than they were when first identified as central concerns of the discipline.