KANSAS CITY, Mo. — In an effort to explain his stance on abortion, Representative Todd Akin, the Republican Senate nominee from Missouri, provoked ire across the political spectrum on Sunday by saying that in instances of what he called “legitimate rape,” women’s bodies somehow blocked an unwanted pregnancy.

Asked in an interview on a St. Louis television station about his views on abortion, Mr. Akin, a six-term member of Congress who is backed by Tea Party conservatives, made it clear that his opposition to the practice was nearly absolute, even in instances of rape.

“It seems to me, from what I understand from doctors, that’s really rare,” Mr. Akin said of pregnancies from rape. “If it’s a legitimate rape, the female body has ways to try to shut that whole thing down. But let’s assume that maybe that didn’t work or something: I think there should be some punishment, but the punishment ought to be of the rapist, and not attacking the child.”