He clearly had four years of service before being elected. He also had over 700 days before he announced.
You also know he has far more experience with and knowledge of the Constitution than Trump. I don't know if he actually taught con law 1 or seminars that deal with constitutional law. He did teach the subject at law school and was editor of law review at Harvard.
The gist of what I said is far more accurate than the gist of what you said on the subject.