Why is Obama having such a hard time filling cabinet posts?

US Treasury Secretary Timothy Geithner is practically alone on the job, working night and day to cope with the worst economic downturn in decades. Of the 15 key Treasury Department positions that require Senate confirmation, only one has been filled. Stuart Levey, a leftover from the previous administration, who as under secretary of the treasury for terrorism and financial intelligence, is not central to the crisis management however.