I think the onus falls on the GOP to stop attacking Akin and actually support him. He is the nominee based on a primary.
This is all on Akin from here forward. After his inappropriate comments regarding rape he decided to stay in the race. He said that the issue would blow over and that true conservatives would come to his aid and would donate enough money to support his campaign. Huckabee came out and announced his continued support. Akin is in this race and if his position is so strong and righteous he should be able to raise the money necessary to compete. If not, its all on Akin.
It doesn’t take much to figure out how this is going to play out. Akin will lose the election, blame the GOP for not supporting him and claim that it was a conspiracy to keep a good conservative from winning. The GOP will point to wins by Cruz, Fischer, etc. and claim that Akin was radioactive after the legitimate rape comments and should have stepped aside. In the end, McCaskill will be the senator from Missouri and casting votes for more contraception and more liberalized abortion.