Among many other changes to the health care system, the ACA created an expansion of Medicaid – made optional by the Supreme Court in 2012 – funded largely by federal dollars. Thus far, 30 states and the District of Columbia have accepted the Medicaid expansion. And as should be expected, states that expanded the program have seen spending grow much faster than those that didn’t. In a recent report, the Kaiser Family Foundation found that total Medicaid spending grew nearly 18 percent in expansion states, though the state share of growth was relatively low (less than 4 percent). And while health care has remained relatively quiet as a campaign issue, Governors Kasich and Christie – both Republican presidential hopefuls – expanded Medicaid (and both have defended this expansion) in their respective states.