So, a court finds that one branch of government doesn't have carte blanche to rummage through the papers of another. The Speech or Debate Clause isn't my area of practice, but could this "win" come back and bite Congress when Congress tries to force documents out of the executive branch?

If classical Athens took children from their parents at birth and them adapted and raised in common by guardians, would the state of Oklahoma be obligated to recognize the adoption? See Meyer v. Nebraska.

Considering the Speech and Debate Clause speaks explicitly to the prerogatives of Congress, I can't imagine any reason this decision would have anything whatsoever to do with protecting witnesses or documents belonging to the Executive Branch.

Except that Rep. Jefferson's actions on the floor, engaging in speech or debate, were not at issue in the criminal proceeding. To go beyond, to the concept that some of a legislator's files are constitutionally protected, one must go outside the clause into a broader concept of protecting files and thoughts against inquiry by another Branch.