The Obama and Romney camps are trying to exploit very different issues as they stake their claim on women, a coveted group of swing voters who will play a pivotal role in the fall election. The Obama campaign is trying to sell the benefits of the president’s health care law, sensing an opportunity to energize Democratic women and appeal to independent women repelled by the Republican focus on social issues. From health care, contraception and abortion to spending and deficits, the campaigns for Obama and Romney are trying to exploit very different issues as they covet women voters.