Thirty-six states will hold elections for governor in less than three months, and Medicaid expansion is shaping up as a key campaign issue in many of them. In Florida, where a crowded field of candidates from both parties is vying to succeed outgoing Gov. Rick Scott (R), the leading Republicans oppose expanding Medicaid eligibility while the leading Democrats support it. Democrats have seized on the issue by highlighting Scott's shifting positions on expansion: He said he supported it in 2013...