No, I'm not impressed with his credentials as a "constitutional historian" because he has none. Displayed none to my knowledge, anyway. That he's been in the Senate for a long time is nice (I'm curious how many votes Teddy Kennedy has to cast before he too becomes an historian), and that he has the constitution memorized is nice, but that no more makes him an expert on constitutional history than memorizing the back of a baseball card makes one a go-to guy on how to play baseball.
You are obviously do not know the meaning of the word, "Historian."
Historian:
1. A writer, student, or scholar of history.
2. One who writes or compiles a chronological record of events; a chronicler.
But frankly, I do not know why I ever wasted my timed trying to explain it to you because you are basing you comments on emotions rather than facts.