“…While it captures overall news exposure, it does not distinguish news sources and so does not test the selective exposure thesis that has taken on greater significance as the variety of news sources has multiplied (Best, et al 2005, Mutz and Martin 2001, Mutz 2006, Stroud 2008, Taber and Lodge 2006. That is, individuals, perhaps by choice, are exposed to homogeneous, politically biased, and partisan frames that affect their interpretation of the political world, their views on issues, the labels they use, and their ideological identities.…”