(1) The elected members of every commodity board shall be elected by secret mail ballot under the supervision of the director. Elected producer members of the board shall be elected by a majority of the votes cast by the affected producers within the affected area, but if the marketing order or agreement provides for districts such producer members of the board shall be elected by a majority of the votes cast by the affected producers in the respective districts. Each affected producer within the affected area shall be entitled to one vote. Elected handler members of the board shall be elected by a majority of the votes cast by the affected handlers within the affected area, but if the marketing order or agreement provides for districts such handler members of the board shall be elected by a majority of the votes cast by the affected handlers in the respective districts. Each affected handler within the affected area shall be entitled to one vote. If a nominee does not receive a majority of the votes on the first ballot a runoff election shall be held by mail in a similar manner between the two candidates for such position receiving the largest number of votes.