Aaron Carroll : Mitt Romney 's running mate . Ryan 's proposals for Medicare , Medicaid sharply differ from Obama 's . He says Ryan 's Medicare plan could change quality of care , increase cost to seniors . Comment: Carroll : Obama 's approach is different ; ideally a compromise would keep best of both plans .
Aaron Carroll : Ryan 's proposals for Medicare , Medicaid sharply differ from Obama 's . He says Ryan 's Medicare plan could change quality of care , increase cost to seniors . Comment: Carroll : Obama 's approach is different ; ideally a compromise would keep best of both plans .