You really need a life Dave.
Discussion is locked
... about a ''shakeup''.
Card has been Chief of Staff for Bush's entire administration. Perhaps he wants a bit of a life back, or to make a little money commensurate with his skills.
Changes in GWB's Administration seem so ''important'' only because there have been so few (and a need for so few at that).
Chiefs of Staff
A quick look at that link shows that the last President to even have the same CoS for ONE full term was Reagan in his first term. Reagan had three in his second term, Bush-41 had three for one term, Ford had two for his shortened term, and Carter had 2.5 for his single term (the vacancy being himself ). Clinton had four FWIW.