Romney doesn't have to defend this. All he has to say is that the people of Virginia can choose their candidates on any basis they wish.
Of cou8rse we know this is not true as once a state chooses to have an election, they are regulated by a large body of state and federal law.
And precedent.
No, RPV will be defending any court challenge.
Good luck.
If Team Snake Romney objects, he will have to handle the public relations for his objection and disenfranchised VA voters are going to be really maaad at him.