Notwithstanding any other provisions of this chapter, for the purposes of election contests, a vote cast by a person who has been listed on the official list of electors for a period of ten years or longer shall be rebuttably presumed to be a legal vote despite an unsigned voter registration card, so long as that person continues to meet the eligibility requirements of Code Section 21-2-216. For such a voter, there shall be a rebuttable presumption that the voter has taken the oath and that the voter registration card is a replacement of the original voter registra-
tion card.