This weekend marks 100 days until people can begin signing up for new health insurance coverage under the federal health care law. It also marks another milestone: the launch of an enormous public relations effort to find people eligible for new coverage and urge them to sign up when the time comes. But like everything else about the health law, even this seemingly innocuous effort has been touched by controversy. Somewhere around 30 million Americans will be eligible to enroll in state health insurance exchanges beginning Oct. 1. But lots of those people don't know it. Earlier this spring, one poll found that weren't sure whether the Affordable Care Act was still a law or not.