Via TPM (emphasis added):
The Medicaid expansion field is tentatively set for 2014, and the nation is split down the middle: 25 states (plus D.C.) are expanding, and 25 states are not, according to the Kaiser Family Foundation.
… according to the foundation, 4.8 million Americans won’t be covered as the law intended in those non-expanding states. They don’t qualify for Medicaid now, but would have under the expansion, and they don’t make enough money to qualify for financial help to buy private coverage.
States with either a Republican governor or a GOP-controlled chamber in the legislature (or both) are opting out. In Utah, 57,850 people will not get health coverage due to the lack of Medicaid expansion. In Texas, the number will be 1,046,430.