Aetna and other insurers that initially fought President Obama's health-care overhaul are reversing course, funding a group planning to spend $100 million to help the uninsured get coverage under the law. Enroll America, a nonprofit created two years ago, has gathered support from the insurers that opposed the law and consumer organizations such as Washington-based Families USA that supported it. The group will reach out to the 43 million uninsured whose participation will help strengthen the funding formula that holds the 2010 Affordable Care Act together. The new customers are expected to help offset added costs for the insurers from new regulations and taxes included in the law.