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

itoggle caption iStockphoto.com

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

itoggle caption Mel Evans/AP

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