If we define "political culture" as the attitudes that people have towards government, we can see that agents of socialization will help to determine our political culture. As we grow up, our parents give us our first ideas about political issues. We learn from them how "we" feel about things like crime and poor people and abortion. As we grow older, we are influenced more by peers and by other agents of socialization such as the media, but the basic effect is the same. We are being told what people like "us" believe.
These agents of socialization help to give us our political culture, starting from basic ideas like a belief in democracy to more specific ideas like attitudes towards welfare or abortion.