This is an unbelievably stupid comment and will likely cost him votes, but Braley's had a pretty big lead the whole time and there's month of Republican bloodbath primary to go, so it probably won't cost him the seat.
Of course, as we saw in 2012, one stupid comment can not only cost a seat, but cost seats in other states as well. Hopefully the media in Iowa will let this go pretty soon.
One guy saying some elitist bullsh*t isn't comparable to multiple people trivializing one of the worst things someone can do. There will be no ripple.
Hopefully not, but remember that Murdock's comments probably wouldn't have gotten much press if Akin hadn't already created the "Republicans say horrible things about rape" meme. If this story bubbles for a while, some other Democrat in Colorado or whatever might say something relatively innocuous but kinda elitist and all of a sudden it turns into a national "Democrats are elitist!" meme that affects races all of the country.
Probably won't happen. But it is so important that Democrats retain the Senate that I'm going to be pretty nervous about it.