ObamaCare forced (The Supreme Court changed it from "forced" to "bribed") states to use their Medicaid program to cover everyone whose income is less than 1.33 times the federal poverty line (a little over $11,000 a year). In terms of annual income, that comes out to everyone who earns less than $15,000 a year.
The Federal government is going to pick up most, but not all of the tab for this new program. Where those people who qualify for the program live, and therefore the burden on the state government, changes dramatically state to state. The lowest percentage is Alaska where is is merely 7.6 percent of the population whereas the highest percentage is Alabama where the state would be covering almost 25 percent of the population.
Thanks to US Census data. I was able to put a little map together:
Note that the Southern States is where the program would have the largest impact but also the largest cost. It is also a concentration of states that sued the federal government to stop the implementation of ObamaCare. This leads credence to the argument that these states were suing on the basis of retaining their own budget priorities instead of the federal government's. In all likelihood, the lawsuits still had more to do with politics than policy, but still...