Medicaid director Bob Robinson said that the state is struggling to pay for its current program.
About one-fifth of Mississippi residents are already covered by Medicaid, a government health insurance program for the needy.
Robinson said by 2014, enrollment could rise to one-third of the population.
Advocates for the poor say some of the people who could be added to Medicaid are now having a hard time because they can't afford private insurance.
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