On April 16, the Florida Constitutional Revision Commission issued its final decisions on which proposed state constitutional changes to put on the November 2018 ballot. According to this story, the Commission voted not to change the primary system.

There had been support for a constitutional amendment saying that write-in candidates in the general election should be deemed not to exist, in connection with partisan primaries. Current law says when all the candidates for any particular partisan office are from the same party, then the August primary for that particular office is open to all registered voters, no matter what their partisan affiliation. This has been the law for 20 years.

Current law treats declared write-ins candidates in the general election as though they were not members of any particular party. So, when someone files as a write-in for the general election for a particular office, the primary for that office remains closed, even if all the ballot-listed candidates are from the same party.

No independent candidate has ever been on an Indiana government-printed ballot for either U.S. Senate or Governor. Businessman Nathan Altman will attempt to get on the ballot this year for U.S. Senate. See this story.

No minor party or independent candidate petition for statewide office has succeeded in Indiana since 2000. Indiana is one of only four states in which Ralph Nader never got on the ballot, even though he is the person who placed third in 2000, 2004, and 2008.

NBC News has published this article by political consultant Reed Galen. It explains how ballot access laws in many, if not most states, make it difficult or impossible for independent candidates to run.