I really don't see what the problem is with the term "legitimate rape." Of course there is both legitimate rape and accusation of rape. Not all accusations of rape are true and not all rapes under the law are the same. Rape can be consensual but statutory and it can be and often is a lie. So Aiken didn't make the big faux pas that is being bantered about.
His point was that the female body can when highly stressed, fail to ovulate and thus become pregnant from a rape, where otherwise she might indeed become pregnant. Whether, or not that is an iron clad fact is not the point; it is what Aiken had been led to believe. His blunder was saying anything at all that the media could turn into a big deal. And I'll guarantee you that it just wouldn't matter what he said, the lame stream media is going to do anything they can to try to get Mcaskill reelected. They know full well how critical her Senate seat is and how unpopular she is in Missouri.