Lynn Vavreck presents a study on TV habits and political affiliation:
When we examine the viewership of each show ... interesting partisan composition emerges. Republicans make up more of the share of the audience for NCIS (48%) and Criminal Minds (41%), while shows like Desperate Housewives (55% Democrats), The Mentalist (54%), and CSI:Miami (50%) are much more likely to be composed of Democrats than Republicans. Extreme Makeover is a pretty even mix of partisans from both parties. Where there are differences, they are significant, at least in a statistical sense.
What’s interesting about these trends in television viewing is the similarity between the programming of shows like NCIS and CSI:Miami both shows are about forensic science and criminal investigations yet, partisans somehow manage to sort themselves into the shows in a systematic way.