You can tell how liberal or conservative you are yourself by what jokes or cartoons that you think are funny. Any time I look at something like that and wonder why I don't get the joke, I realize oh yeah, it's conservative. They don't think like I do. I wonder if middle of the roader's think all political jokes are funny or not funny.
This is true to a degree, but only for the hyper partisans on either side. I lean very hard to the right, but easily laugh at conservative and liberal jokes alike.