1. The direct answer to your question is that he has now endorsed a past President whose administration tried to kill Assange, in an election against someone who has never been President, thus has not had the chance to pardon Snowden or Assange, but who has been part of an administration who at least eventually freed one of them from prison 

2. The indirect answer to your question is that you already have access to all the information needed to answer your question and you're choosing to ignore the answer to ask me and waste time because RFK Jr is so good at getting time wasted