Welcome to Librarium Online!
I know you get to re-roll casting psy-power with embold in the unit. and here is my question: do you get to re-roll leadership when using mind war?
IIRC mindwar is not a leadership test but a roll that you add your leadership to. If that is the case then no you do not get to reroll. I do not have access to my codex right now so I can not check the exact wording to be sure.
Indeed nakaruru is correct, sadly this is to our disadvantage in most situations...