That's the kind of devil's bargain that unconstitutional federal benefit programs often lead to. If Texas state government agrees to tax its own people $15 billion, then the federal government promises to tax the rest of America $100 billion.
Republicans and Democrats both want to get their hands on "free" federal money. So it will be surprising if Texas legislators don't find a way to work something out with the Obama administration.
But Libertarians have always spoken against programs like Medicaid. Providing benefits to people is not a proper function of government.
Let's get government out of health care, and we won't have to worry about these nasty devil's bargains.