Write in Votes

Why can states refuse to allow write in votes? If you read these 3 amendments to the Constitution, you will see that you cannot deny or abridge the right of citizens to vote for almost anything except the states can refuse to let a person vote for a write in candidate and therefore in effect abridge their right to vote.

Amendment XV
The right of citizens of the United States to vote shall not be denied or abridged by the United States or by any State on account of race, color, or previous condition of servitude.

Amendment XIX
The right of citizens of the United States to vote shall not be denied or abridged by the United States or by any State on account of sex.

Amendment XXIV
The right of citizens of the United States to vote in any primary or other election for President or Vice President, for electors for President or Vice President, or for Senator or Representative in Congress, shall not be denied or abridged by the United States or any State by reasons of failure to pay any poll tax or other tax.

I believe that candidates should have the right to run for office and citizens should be allowed to vote for them with a write in vote.