Michele Bachmann is on the defensive about comments she made earlier this week suggesting that a vaccine against a virus linked to cervical cancer poses a danger to young girls. "During the debate, I didn't make any statements that would indicate that I'm a doctor, I'm a scientist or that I'm making any conclusions about the drug one way or another," the GOP presidential hopeful told reporters here who questioned her about the story she told suggesting that the vaccine had caused mental retardation. Asked whether she would apologize for comments that outraged medical experts say will discourage parents from...