Nothing new. In fact, Rudy Giuliani did about the same thing following 9/11 on Saturday Night Live as well. I guess they’re both similar politicians.
Actually, the original unexcerpted article addressed that:
Yes Giuliani went on Saturday Night Live a few weeks after September 11, but that wasn’t a series of gags, it was a serious tribute to those who died in the attacks. It had very little in common with Christie showing off the same routine that he does every time he’s in the vicinity of a video camera