Todd Akin was an excellent Congressman and Conservative, but his sole mistake was an ill-advised comment that violated the Clayton Williams rule (since up until that point, he led McCaskill in the polls by a wide margin). I doubt Stockman will make THAT mistake.
I wouldn't call it his sole mistake. Akin had a lot of quotes for McCaskill to call upon - against Social Security, against Medicare, against the minimum wage. As it happened he managed to do himself in before McCaskill had to haul the other quotes out. Akin was a disaster waiting to happen from the moment he got the nomination. That's why McCaskill was so glad to run against him.