A person voting at the primary shall be required to ask for the ballot of the party in which the voter wishes to vote and an election official shall record the voter's choice of ballot by marking the entrance checklist with a letter code, as designated by the Secretary of State, to indicate the voter's party choice. The names of all candidates on the ballot shall be listed in alphabetical order. Each voter may vote for one candidate for the presidential nomination of one party, either by placing a mark opposite the printed name of a candidate as in other primaries, or by writing in the name of the candidate of the voter's choice. (Added 1979, No. 199 (Adj. Sess.), § 1, eff. May 6, 1980; amended 1995, No. 38, § 4; 2003, No. 59, § 43.)