TV is the main contributor. For 5-6 years all TV has done is shown propaganda negative towards Bush, republicans, and Christians in general. Is it any wonder that Americans vote Obama twice when all of a sudden you have most TV personalities, news, shows, talk shows, comedy, movies, and anything else on TV plugging for Obama like he is the savior of the world? Take away the media, and comedy-news shows, and the democrats lose.
I think it could easily be the other way around, the leftist slant of the TV is a result of the leftist swing in this country. Or maybe they happened concurrently.