The perception of a moderate is so skewed because of how far right the GOP has moved in the past 5 years. 5 years ago, Christie would be (and was) considered a hardcore conservative. "Hugging Obama" is not a policy that places you further to left on an ideological spectrum.
The GOP has been as nuts as it is today at least since the Gilded Age.
Eh, it's had a few phases of being less nutso (the 50's, for instance). But I would definitely agree that it is just as nuts now as it was then.
The GOP has, since 1877 at the very least, been the party of the aggressive, insane variety of capitalism.