C.R.S. § 1-4-1205

A write-in vote for any candidate on the presidential primary ballot shall not be counted unless the candidate for whom the write-in vote was cast has filed a notarized candidate’s statement of intent to seek the office of president of the United States. Any such affidavit must be accompanied by a nonrefundable fee of five hundred dollars and must be filed with the secretary of state no later than the close of business on the sixty-seventh day before the presidential primary election.