Mike Pence can prove right now if he values the presidency more than his country.
He stands to be the candidate himself if the jerk withdraws. (I won't use the jerk's name again.) I think there's about a zero chance that the jerk will quit. So Pence should. He should make a pledge to the American people: either the jerk withdraws his candidacy by such-and-such a time/date, or I will withdraw as his running mate. The best face I could put on such a move would be that he respects his country and his espoused religion more than he wants to be president. The worst is that he would immediately become a repug hero, almost assuring his nomination next time. Whatever his motives, he can no longer afford to be on the same ticket as the jerk, a self-revealed sexual predictor.
Whatever we see him do from this point of the campaign out, it will be how the leadership wants him to play it, and that basically means carefully walking both sides of the street.