The idea of a media-saturated environment, where Americans learn most of what they know (or think they know) about candidates and elections from the media, has been with us for some time. But shifts in the media landscape in the past few years have made even the last general election look out of date. Twitter and other social media, and the steady fragmentation of audiences, have all affected the way we get the information we need to choose those who govern us. Media convergence and media divergence have exacerbated splits among demographic groups. Candidates and their supporters, at least some of them, have become more sophisticated in manipulating media coverage. This year, particularly, we have seen assumptions about how media influence ...