This McClatchy newspaper chain story about Laurence Kotlikoff says that he has filed as a write-in presidential candidate in every state that has such a procedure, except for North Carolina. Kotlikoff does appear to have the best resume for presidential candidates this year who are mostly depending on write-in votes. He has been diligently filing as a write-in in virtually every state, and had been planning on doing this since 2015. As the story says, he also got himself on the ballot in two states, Colorado and Louisiana.
However, he did miss filing as a write-in in Delaware, as well as North Carolina. The story says he plans to bring lawsuits against the states that don’t allow write-in votes for President.