Idaho Code § 34-711: Certification of candidates for president, vice president and presidential electors.

The state chairman of each political party shall certify the names of the presidential and vice-presidential candidates and presidential electors to the secretary of state on or before September 1, unless a five (5) day extension is granted by the secretary of state, in order for them to appear on the general election ballot. The secretary of state shall certify such candidates to the county clerks at the same time as certification of political party candidates nominated for state and federal offices by the voters in the primary election.