“A loophole in the federal health care overhaul would allow many employers to game the system by dumping their sicker employees onto public health insurance exchanges, according to two University of Minnesota law professors. They say the loophole could have dire consequences for the financial health of the exchanges, which are a key part of President Barack Obama’s health care law. The online marketplaces are intended to make it easier to comparison shop for health plans and also to expand access to coverage for the uninsured.”