Republican John McCain, an abortion rights opponent with a conservative Senate record on the issue, seems content with the public's perception that he's more moderate on the subject. Democrat Barack Obama, who supports abortion rights, is only too happy to remind voters where McCain stands, but he tries to make his case without attracting too much attention. Both presidential candidates are gingerly trying to strike the right chord on abortion as they reach out to a critical voting group _ independents and moderates, primarily women in swing-voting suburban regions of crucial states such as Pennsylvania, Michigan and Ohio. The candidates'...