The federal government will likely be involved in running the ObamaCare exchange in at least 30 states, 26 of which expressly declined to establish state exchanges. One health-policy expert refers to it as an "administrative nightmare" for the Department of Health and Human Services. Friday was the deadline for a state to let HHS know if it planned to establish a state exchange. Thus far only 18 states and the District of Columbia are planning on doing so. As of right now only Utah and Florida remain undecided. Utah may still decide to set up a state exchange, but few...