Ann Romney doesn’t consider herself wealthy. Because she suffers from multiple sclerosis, she counts her riches differently, she told a recent interviewer. She measures them “by the friends I have and the loved ones I have.’’ As she knows, illness is the great equalizer, since it strikes without regard for net worth. But it can also be the great divider, in terms of access to health care. That’s what health care reform is aimed at changing and what her husband once championed.