Pretty dramatic. The meaning, as this article concludes, is exactly what has seemed obvious for a long time:
In other words, Democrats and Independents have changed their viewing habits only slightly while Republicans have flocked to Fox and dropped both CNN and MSNBC in droves. Back in 2000, it turns out, the viewing habits of all three groups were pretty similar. Since then, as Fox has steadily amped up its conservative branding, conservatives have decided that's all they want to hear. The echo chamber must be getting pretty deafening over there.
I've said, because it's true, that a fundamental difference between (today's) liberals and conservatives is that the latter seem to need constant reinforcement of their beliefs, and reject any fact-based threat to them. While not, I suppose, a universal truth, it most certainly applies to people of teabagging mindset. In droves.
There was a time, I admit, when I watched MSNBC religiously, for maybe a year. Then I tired of it. I lost interest in hearing the same people predictably say the same things, superficially, over and over. The loudness disturbed me, as did the uniformity. I realized I wasn't learning anything new. So I turned to the intertubes where the cacophony is deep and broad, but where, between the extremes of both sides there are sites full of thoughtful discussion and insight, by smart people with inquisitive minds.