Medicaid reform doesn’t mean abandoning the disadvantaged. Medicaid costs taxpayers nearly $900 billion a year. That figure is on track to exceed $1 trillion by the end of this decade. The entitlement is growing faster than the economy. That kind of growth is unsustainable -- and risks shredding the safety net for those who need it most. Republicans are confronting that mathematical reality as they hunt for savings in a program that now provides health coverage...