Half of all 20 seats are up in every even numbered year.
Position is filled by a person who is a member of the same party as the former member.
Nominees of the political party may be selected by the respective party district committee and the petition shall be signed by the chair of the party district committee or by any other party official designated by the party by-laws. House appointments are confirmed in the House. Senate appointments are confirmed in the Senate. There is a deadline of 30 days to make the appointment after notification of the vacancy. Senate vacancies with terms less than two years, five months are appointed.