Republicans are tradionally lousy campaigners. Few of them study their enemy and do what works. College indoctrinated, they are taught to be ashamed of their stand on issues.
I know he has a lot of detractors here on FreeRepublic (for good reason), but Chris Christie owes his success to the fact that he is a superb campaigner. He probably doesn't have a future in elected office outside of New Jersey because his approach will rub a lot of Americans the wrong way, but that guy really knows how to get a message across and belittle his opponent effectively in a classic New Jersey way.