Each political party shall select a number of candidates for electors of President and Vice-President of the United States equal to the number of senators and representatives to which the state is entitled in Congress. The candidates for electors shall be selected by the state party convention or in any other manner prescribed by the bylaws of the party. The chairperson and secretary of the state convention or any other party official designated by the party bylaws shall certify a list of the names of candidates for electors to the director on or before September 1 in presidential election years.