I thought she was innocent? When you are innocent you don't need a pardon for things you didn't do. Obama is covering his own tail by pardoning her then he eliminates his own culpability in the email situation that he knew about also.
At least when Nixon got caught he forfeited the White House and the Presidency but with Hillary she will lose nothing. But at least somewhere in the back of her mind she will know that it contributed to her losing the ability to be the first Woman President and Obama will go down in history as having a tainted Administration that he had to pardon in order to keep from going to jail.
Proof positive that there IS something there after all otherwise there would be no need for a pardon.