Growing up, my family was never into politics. Any politics that I happened to notice came from my public school teachers. Really, I didn't start noticing much until about high school, and only then to try to figure out why some of my friends got so annoyed when the American History teacher constantly referred to Nixon as "tricky Dick".
When I was getting close to the end of my college years, I started paying attention, and doing my own research. I began to realize how much bull had been shoveled into my head, politically, at the hands of most (not all) of my teachers up through high school. Of course, I hadn't realized it then, and that's the way the left wants it.
For instance, whenever I would think of the civil rights era - MLK Jr., the marches, the hoses, the dogs, etc, I always assumed that it was the Republicans who were at fault for the way the marchers were treated. Just listening to the media would prove how raaaacist the Republicans are, and how they hate anyone that doesn't share their skin color.