Colorado Revised Statutes Title 1. Elections § 1-2-218.5. Declaration of affiliation

(1) The declaration of affiliation of each registered elector shall remain as recorded in the registration record until the elector changes or withdraws his or her affiliation.

(2) Any eligible elector who has not declared an affiliation with a political party or political organization must be designated on the registration records of the county clerk and recorder as “unaffiliated”. Any unaffiliated eligible elector may, but is not required to, declare a political party affiliation when the elector desires to vote at a primary election, or the elector may declare his or her political party or political organization affiliation at any other time during which electors are permitted to register by submitting a letter or a form furnished by the county clerk and recorder, by mail, in person, or online in accordance with section 1-2-202.5. An unaffiliated eligible elector need not declare an affiliation to vote in a presidential primary election.