Regarding a Presidential pardon ...
Gerald Ford famously pardoned Richard Nixon even though no criminal conviction had been obtained. There was never a vote to impeach by the entire House, only a vote by a subcommittee, so technically there weren’t even any charges filed against Nixon. It was a “just in case” pardon.
But the country was ready to put the Nixon episode into the rear view mirror. Years of hateful press and a citizenry angry over Vietnam helped drive the decision to let Ford’s pardon stand, unchallenged. Time to move on.
However, can a pardon be issued without an actual crime to forgive? Can a pardon be issued just to alleviate suspicion? That sounds fishy to me.
Maybe it was actually a blessing that Comey chose not to press charges against Hillary. Once we install a new AG (Christie? Judge Jeanine?), a new FBI director (Sheriff Clarke?), and squadron of new US Attornies, then let’s see how Hillary’s little game plays out! If Obummer tries to pardon her for suspicious activity, just say no.
When Obama pardons her can he also pardon her for future crimes? Because the criminal acts of her Clinton “Foundation” will go on and on.
Giuliani
Any SCOTUS (aside from one re-populated by Hitlary) would be forced by the Constitution to so decide -- if the question of such a pardon were ever heard by them.