That simply isn't true. As a retired USG bureaucrat with 36 years of service, I have some knowledge of how the system works. All the political appointees must submit their resignations when a new administration takes over. Have you ever heard of the Plum Book? It contains all the presidentially appointed positions within the Federal Government.
If you want to take the time, go over all those positions using the link I provided and tell me which one's are "Bubbas." I bet you would be lucky to find one or two who served under Clinton and were kept on by Bush. Personally, I have never seen it happen during my years in the USG except if the change in Administrations didn't involve a change in political parties. The political appointee jobs are avidly sought by the political faithful and are handed out as rewards to the supporters, i.e., the spoils system is alive and well. There are many more applicants than positions. Also, there is pressure to try to convert career jobs into political jobs or have political types apply for career jobs.
There's a boatload of things a President can do to apply pressure to civil service employees.. Since just being a democrat makes you a security risk.. pressure should be applied.. across the board to "civil servants" in the Executive branch.. But why would Bush even care about all that.. hes a globalist..
Actually, there is very little a President or a political appointee can do to a career employee unless he/she violates their conditions of employment. The political appointees can reorganize some elements and eliminate jobs, but Congress also gets in the act if it is too radical and the career employees affected by the elimination of their jobs would have "retreat" rights, which would allow the senior employees to be retained in other positions. The net result of RIFs (Reductions in Force) is that the most junior employees are let go. It is very difficult to fire a federal employee.
Would very easy if we had a party that would eliminate federal programs.. and reduce by half or more, others.. We don't.. And we won't until the federal bureaucracy is called rampant socialism and parasitic to the states.. and the republic..
Civil servant unions(extant) should be illegal because of the conflict of interest generated as a parasite to good government.. as should teachers unions.. Teachers ARE civil servants..