Maybe, but if Russia actually tried to adversely tried to influence a USA election and Sessions was oblivious to the threat, then it doesn't speak well of his capacity on the Armed Services committee,   If he failed to react to such a threat, then he was derilect in his duty.  If he encouraged such a threat, well... That's another matter to be decided.  Sessions, on his own, has put himself in an indefensible postion and a 'pardon' would open up another Pandora's box.  En garde, on the streets.