Same with 2 year cycles for the House. If the newly elected government acts in a way that the public doesn't like, we can partially replace it pretty quickly.

Same with 2 year cycles for the House. If the newly elected government acts in a way that the public doesn't like, we can partially replace it pretty quickly. Four year cycles for the house would mean we would have no way of changing course for four full years (other than impeachment, and we've seen how ineffective of a check that is if the president's party controls the Senate)