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By Steven Lubet, The Conversation — President Donald Trump has exercised the pardon power more aggressively and creatively than most of his predecessors, granting pardons to political supporters such as Joe Arpaio and Dinesh D’Souza, and a posthumous pardon to Jack Johnson, the first black heavyweight champion, who was convicted on a racially fraught charge of violating the Mann Act. Trump has mused about pardoning former Illinois Gov. Rod Blagojevich, as well as Robert Mueller’s probe…