But even if Pollard is guilty of all that Hersh charges him with, Clinton the politician knows that freeing him is a political win, a present to some of his dearest supporters.
Clinton knows that freeing Pollard would be political suicide. 
mnli hypothesis: Clinton knows that freeing Pollard would be political suicide.  premise: But even if Pollard is guilty of all that Hersh charges him with, Clinton the politician knows that freeing him is a political win, a present to some of his dearest supporters.