Do people in the USA forget the purpose of having both a senate and a house of representatives?

A senator is supposed to represent the interests of your state government. That's why they originally were chosen by the state government and not elected by the people. Your representative is supposed to represent the interests of the people in your district. Seems that most people these days forget that. Why hate on Kyrsten Sinema? I think she is doing a good job voting the interests of her state - one that is barely blue. I'm not sure why she should be expected to be progressive, because even the democrats in Arizona are not very progressive.