Obamacare supporters are mounting a campaign to get Medicaid expansion on the Florida ballot in 2020, potentially elevating the Obamacare program as a key election issue in the presidential swing state. A mix of national and local health care groups, energized by the approval of Medicaid expansion ballot initiatives in three conservative states in November, have been collecting signatures for weeks to support a voter referendum that could cover an additional 700,000 low-income Florida adults.