I agree with your thought, but I have long silently maintained to myself that the arrogance and political catechism of ‘junior’ and ‘senior’ with respect to a United States Congressman or Senator is patent bullshit.
In effect, tagging an member of Congress with such is an insult to the ultimate holders of that office - the people of that district or state. In this regard, calling them ‘junior’ is an unwarranted and completely inappropriate act. No group in this country should have ‘seniority’ over another.
Le me guess..you’re a distant relative of Ernest Hollings..(g)