A list of the most prominent government officials who have been kicked out because of ideological reasons can be found in an article on TomDispatch.com. From the article:
"..the seemingly endless and ever-growing list of beleaguered administrators, managers, and career civil servants who quit their posts in protest or were defamed, threatened, fired, forced out, demoted, or driven to retire by Bush administration strong-arming. Often, this has been due to revulsion at the President's policies -- from the invasion of Iraq and negotiations with North Korea to the flattening of FEMA and the slashing of environmental standards -- which these women and men found to be beyond the pale.