Voters will be asked in November whether to support a Legislature-proposed plan for congressional and legislative redistricting.
In a 25-14 decision, senators added to the ballot the choice of supporting a new constitutional amendment that supporters said will ensure Florida does not break any laws or disenfranchise minority voters.
The ballot choice, supported by Republicans and some Democrats, is a response to ballot amendments 5 and 6, which were proposed by Fair Districts Florida.