Missouri Republican congressman says "misspoke" about raped women

* Republican candidate says pregnancy in "legitimate rape"

cases rare

* Romney campaign shuns Missouri candidate's position

WASHINGTON, Aug 20 (Reuters) - The Republican challenger for

a hotly contested U.S. Senate seat in Missouri said on Sunday

that he "misspoke" when he said women have biological defenses

to prevent pregnancy in cases of "legitimate rape," making legal

abortion rights unnecessary.

U.S. Representative Todd Akin, who is running against

Democratic Senator Claire McCaskill in the Nov. 6 election, made

the comments to KTVI television in St. Louis, drawing swift

protest from McCaskill and other Democrats.

Akin, a Tea Party-backed conservative who opposes abortion,

said in the interview that the need for abortions in the case of

rape was "a particularly tough ethical question."

"It seems to me, from what I understand from doctors, that

is really rare," Akin said of pregnancy caused by rape. "If it's

a legitimate rape, the female body has ways to try to shut that

whole thing down," Akin said.

"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."

McCaskill, who is considered one of the most vulnerable

Senate Democrats in a state that has shifted to the right since

she was first elected in 2006, immediately fired off a rebuke on

Twitter.

"As a woman and former prosecutor who handled 100s of rape

cases, I'm stunned by Rep. Akin's comments about victims this

AM," she wrote.

Akin later backtracked, saying in a statement:

"In reviewing my off-the-cuff remarks, it's clear that I

misspoke in this interview and it does not reflect the deep

empathy I hold for the thousands of women who are raped and

abused every year."

He promised that rape victims "will have no stronger

advocate in the Senate to help ensure they have the justice they

deserve" if he was elected.

However, Akin did not back down on his position opposing

abortion in the case of rape, adding: "I believe deeply in the

protection of all life, and I do not believe that harming

another innocent victim is the right course of action."

Republican presidential candidate Mitt Romney's campaign

distanced itself from Akin's position.

"Governor Romney and congressman (Paul) Ryan disagree with

Mr. Akin's statement, and a Romney-Ryan administration would not

oppose abortion in instances of rape," the statement read.

Akin, a six-term congressman from the St. Louis suburbs, won

a hard-fought three-way primary race two weeks ago. McCaskill's

campaign spent funds during that campaign to help him win,

viewing him as a far-right conservative who would be easier to

defeat in November.

(Reporting by David Lawder; Editing by Fred Barbash and Paul

Simao)