The victory last nigh means absolutely nothing.  It was a safe seat already in the Republican column, and was not going to be lost considering the inept candidate propped up by the Democrats.  The votes were already submitted by a large number of people, and an incident the night before the polls open will not change anything other than something catastrophic.  Many of Gianforte's base were ecstatic that he took on the media in a physical way.  Conservatives want to see more of it.