Attorney General Merrick Garland is under fire from the left, and now, even from his own former Harvard constitutional law professor, after Special Counsel Robert Hur’s final report on President Joe Biden’s handling of classified documents included what experts say were partisan remarks about the President that violated Dept. of Justice practice. “Merrick Garland will be one of the greatest Attorneys General in American history, bar none. As my brilliant con law student, a principled prosecutor, and later a superb DC Circuit judge, he has displayed integrity, courage, fair-mindedness, and huma…