An initiative is currently circulating in Florida to establish a top-two system for state and local office. According to this story, the initiative is being supported by Mike Fernandez, a wealthy individual who has already spent $6,000,000 on the petition. It has 621,000 signatures already, so is likely to qualify for the November 2020 ballot.

Initiatives in Florida cannot pass unless they get at least 60% of the vote. No top-two initiative has ever received as much as 60% of the vote, and no top-two initiative has ever passed except in Washington state in 2004 and California in 2010. Top-two initiatives have been defeated in Arizona, South Dakota, California in 2004, and in Oregon twice, in 2008 and 2014.

Here is the summary of the measure, as printed on petitions.