This is the statement of the FBI and I respect the validity finality of their recommendation that comes with this letter and the authority of the person making the recommendation.
If there is to be any debate against this outcome it shall be from a successful attack on one of the premises:
* "... we cannot find a case that would support... " is a very strong statement. A single court proceeding meeting that criteria could invalidate Comey's recommendation. * Emails were deleted before State gave them to FBI. If a single email between Clinton and an aid related to "clearly intentional and willful mishandling of classified information" this could change the outcome. NSA and adversary's signal collections may have a copy of such an email. A leak may change Comey's decision. * FBI was not given full access to Clinton's emails (they were whitelist-filtered first) and Comey does not believe this counts as "[effort] to obstruct justice". Another case which found "efforts to obstruct justice" based on a similar action could invalidate his reasoning. * "But that is not what we are deciding now." If there is any case of DOJ prosecution resulting in "security or administrative sanctions" then it would invalidate Comey's stance that "no charges are appropriate in this case".
Perhaps a crowdsourcing effort can be made to find the above things. Such new evidence would question the soundness of this letters' finding. Would you like to be part of the search?