I don't know if you could call it a Preference Cascade - for that you would need enough intelligence to have your own preferences instead of one imposed upon you by the group. As Libertas indicated, these are not people who think for themselves and therefore cannot develop an opinion other than that of the group. Liberals follow fads, and thankfully I think Obama, and to a lesser degree, politics in general are falling out of favor.
We drove through the People's Republic of Boulder, Colorado last night and saw only a few Obama stickers - and they were old. I didn't see one 2012. Even saw one car plastered with Bumper stickers - and not an Obama sticker among them. Even the number of cars with any bumper-stickers at all had plummeted in my experience.
Obama? Oh Man he is so 2008. I am so over that. Politics? Is all fighting and bad for my Karma. My life is too important to waste on such things.
The cool kids have tried politics and have seen that it is not something they succeed at, so they are wiping their participation from their memories in the same way we pretend that we never owned a polyester shirt or bell bottom pants in the 70s. Maybe its too optimistic, but I really think they are abandoning the area as bad for their egos. The friends who ousted me from their blog are still my "friends" on facebook, and while I post nothing but the very best examples of liberal fascism there, they are posting nothing but pictures of their kids playing baseball, their amazing organic gardens, and celebrating their superiors choices in restaurants, and their fabulous vacations to somewhere better than where you went. Perhaps they just don't use Facebook for that, but when thy had that blog 90% of it was political content, even though it was supposed to be for "facebook" type sharing ( this was before facebook)
Anyone else seeing a drop off in Liberals being willing to express a political opinion? Maybe conservatives speaking up and confronting them has finally made them realize politics isn't "cool" and the they should stop trying to bring enlightenment to the low sloping neanderthals in fly over country and just punish us by leaving us to wallow in our ignorance. Oh please, oh please, oh please...