Notwithstanding any other provision of law, a space shall be provided on the presidential primary ballot for a voter to write in the name of a candidate for nomination by the Democratic Party for President of the United States.

Any person who believes his or her name may be used as a write-in candidate for nomination by the Democratic Party for President of the United States shall, not later than 21 days before the primary election, file for endorsement of his or her write-in candidacy with the Secretary of State, or no votes shall be counted for him or her.