That’s BS. Akin was the target of a “macaca” attack which was whipped into a frenzy by over-reactive RINOs. I’m sure the Dems are ecstatic that the GOP keeps shooting its wounded.
McCaskill is evil, but she's not stupid. She calculated that Akin was the conservative candidate most likely to put his foot in his mouth and she spent several million dollars helping him win the Republican nomination. He obliged by making an offhand remark that provided her with the ammunition she needed to destroy his chances of election.
It doesn't matter what he said, what matters is that she used it to full advantage and turned this race around. Voters are emotional and fickle and she and her media buddies hit all the right buttons.