When someone you’d like to vote for isn’t on the ballot, what do you do?
Write him in!
Write him in!"
The problem with that, in this situation, is that they would simply toss that ballot as void. If they can do this, they could do that as well. Good way to get a super-majority (D) throughout the entire state of CO.
Now, if we have even a semblance of law and order in this country, the Supreme Court will toss this illegal attempt to keep a sitting president's leading political rival off the ballot and they'll do so in a way so as to prevent any other such attempts.