Abortion is only one out of thousands of issues the SG will face, and sure it's a contentious issue in American society and in political marketing--but it's not contentious as a legal issue or in the medical field. We have thirty-six years of legal decisions establishing a woman's right to an abortion, and as I understand it the SG has no input there.
This is a non-issue, except to the point of whether Dr. Regina Benjamin feels she can do the job or not. If legal abortion is a problem for her, then she shouldn't take the job. If she can work in that atmosphere (even if she'd make different decisions for herself in a pregnant patient's position), then she should.