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Introduction 2. Conditional political learning Part I. The Participatory Effects of Media Choice: 3. Broadcast television, political knowledge, and turnout 4. From low choice to high choice: the impact of cable tv and internet on news exposure, political knowledge, and turnout 5. From low choice to high choice: does greater media choice affect total news consumption and average turnout? Part II. The Political Effects of Media Choice: 6. Broadcast television, partisanship, and the incumbency advantage 7. Partisan polarization in the high-choice media environment 8. Divided by choice: audience fragmentation and political inequality in the post-broadcast media environment.
A 2007 study studied this question.