From a friend of mine, reacting to the news that Mitt Romney is doing fairly well in the latest polls:
Americans have simply priced in the crazy.
I think that sums it up. At this point, conservatives can pretty much go off the rails as much as they want without paying a very big price. No matter what they do, everyone just shrugs. We're so used to it that it's hard to get people to take it seriously anymore.
Plus the economy is kind of sucky. So there's that too.