Issue voting concerns the extent to which citizens reward or punish elected officials for their actions or inaction on legislative issues. There are debates about styles of issue voting as well as whether it takes place in the United States, but nearly all theoretical models elevate the role of political knowledge. That is, voters must know where politicians stand on policy issues as well as their own positions. While there are a variety of ways citizens could learn about policy positions and actions, the mass media are presumed to play an important role. Yet, demonstrating the empirical linkages has been difficult in the past due to ever-present challenges with data and research designs. More research is needed to understand the various mechanisms underpinning representative democracy.