Regardless of your political opinions, you've got to respect the brains of whoever came up with McCaskill's strategy -- in a tough swing state -- take advantage of the republicans knowing it's a tough swing state and run ads painting Akin as too conservative during the Republican primaries (basically ensuring the least appealing Republican to moderates wins the nomination), then let him fuck up and scare away the female vote.
It's amazing how conservative guys like Akin are, I'm pretty sure Nixon would look centrist next to some of these tea party crazies.
Unrelated: Ohio polls are incredibly stable next to some other states, it's almost like the overloading of political ads in Ohio has caused people to start blocking all the media out and just voting as they would before.