When are kids too young for politics?

B watched Fox News all day Sunday because of the bill that Congress was passing. He had all the televisions in the house going on the same channel in case he walked out of one room and into another. He is very vocal about his opinions and will talk/yell at the television. K was watching in the living room while B was watching in the bedroom. I could hear K saying, "Lady, you're crazy! You don't know what you are talking about!!!! UGHH!!!!!!" She said, "Mom, did you hear what that lady was saying?" All I could do was laugh. 7 years old and she is into politics. Oh boy!!