With a title like that, I thought you saw one of my Facebook posts.
Actually, none of this surprises me. About 60% of my FB connections (won't call most of them friends, just networking) are liberals of some persuasion or another. The result of connecting with many local musicians, artists, as well as for some reason a vast majority of my coworkers are big libs. (funny thing is several of my gay friends are actually Libertarian and hate libs).
All of this is stuff I often would see before I started customizing privacy settings. I started assigning each person a tag, the most popular is LibFr which indicates Liberal Friends. Then I can filter out posts from them and filter out what I post if it is overtly political so they won't see it (need to maintain connections outside political world). Using customized lists and filtering like this saves a lot of heartburn.