use clemency in a sentence.
The Georgia Constitution vests the power of executive clemency in the Pardon and Parole Board.
I'd say porn pretty clearly fails the Miller Test, with the possibility for argument of works containing elements relating to the prurient interest being granted clemency under the third criterion, that is: someone may argue that a work containing a subsection that may generally be considered "obscene" should not be considered "obscene" on the whole because of its other literary, artistic, political, or scientific qualities.
Now as you say he also released a lot of other material, which wasn't directly related to any crime, so he should expect to be punished for that indiscriminate release, and it weakens his case, but I'd also expect some clemency given that the release was clearly in the public interest and revealed many unlawful orders and coverups.
According to Birkenfeld's own request for clemency, the sequence of events that led to him going to the IRS was: after ~4 years of working with wealthy clients at UBS, in June 2005, he found an internal legal document prohibiting many of the actual practices of the bank.