Colonoscopy copay? Zero. iStockphoto.com hide caption

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The heath exchange Mississippi Insurance Commissioner Mike Chaney had in mind got turned down by the federal government. Rogelio V. Solis/AP hide caption

itoggle caption Rogelio V. Solis/AP

Gov. Bill Haslam speaks to reporters after announcing in Nashville, Tenn., on Monday that that he had decided against creating a state-run health insurance exchange. The Republican governor said he will leave it to the federal government to run the marketplace. Erik Schelzig/ASSOCIATED PRESS hide caption

itoggle caption Erik Schelzig/ASSOCIATED PRESS

Nebraska Gov. Dave Heineman announced Thursday that his state will choose the federal health insurance exchange program. Nati Harnik/AP hide caption

itoggle caption Nati Harnik/AP

Problems with a computer system could delay work on health insurance exchanges. iStockphoto.com hide caption

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New Jersey Gov. Chris Christie listens to a question in Trenton, N.J., Tuesday. He has refused to tip his hand on whether New Jersey will set up a federally mandated health insurance exchange or let the federal government handle the chores. Mel Evans/AP hide caption

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Tennessee Gov. Bill Haslam said last week the state could design its own health insurance exchange required under President Obama's health care law. But resistance in the Republican-controlled General Assembly may cause the state to hand that power off to the federal government. Mark Humphrey/AP hide caption

itoggle caption Mark Humphrey/AP