Wyoming constitution
Article 6: suffrage and elections
Section 11

All elections shall be by ballot. The legislature shall provide by law that the names of all candidates for the same office, to be voted for at any election, shall be printed on the same ballot, at public expense, and on Election Day be delivered to the voters within the polling place by sworn public officials, and only such ballots so delivered shall be received and counted. But no voter shall be deprived the privilege of writing upon the ballot used the name of any other candidate. All voters shall be guaranteed absolute privacy in the preparation of their ballots, and the secrecy of the ballot shall be made compulsory.