It is admitted that in some cases the adjudication of the Court of Disputed Returns must have a retrospective effect. If, for instance, a person who has been returned de facto, and against whose return a petition is presented claiming (as in the present case) that another person was duly elected, resigns his place under sec. 19, whether before or after presentation of the petition, the Court must proceed to hear it, and if the Court determines that the other person was duly elected that person will take his place in the Senate, and his term of service will run from the same period as if he had been originally returned. If in the meantime the Houses of Parliament of the State, acting upon his resignation, have assumed to choose a senator under sec. 15, it is conceded that that choice would be superseded by the adjudication. That is to say, all that happened consequent upon the election which is declared void would be disregarded as if it had never happened. The reason is that, as the election itself was void, nothing can be founded upon it, or upon any act of the person who wrongly assumed to act as a senator. The circumstance that the seat is claimed by another is an accident, and not the governing consideration. The election is either valid or invalid. If invalid, the reason of the invalidity is not material so far as regards its consequences. We think it follows that, upon the avoidance of the election itself by the Court of Disputed Returns, the case is to be treated for all purposes, so far as regards the mode of filling the vacancy, as if the first election had never been completed, unless there is something in the Constitution to lead to a contrary conclusion. This view is in accordance with the general rule as to the effect of an adjudication of a competent tribunal on a question of status. If in a suit of nullity of marriage the marriage is declared void, the effect of the judgment is retrospective, and the children of the marriage are illegitimate. So, a declaration of legitimacy in a suit for that purpose, in England, is retrospective and takes effect from the birth of the child. The operation of this rule can only be excluded by the necessity of the case or by express legislation, as in the well known instance of the validation of certain transactions entered into by debtors after acts of bankruptcy, or transactions declared void on the ground of fraud.