One reason is that they have a great deal of trouble raising money. Other reasons are that their cause is limited and they have a narrow appeal to voters. Most Americans dislike the Bureaucracy. This myth is perpetuated by Congressmen. As a matter of fact, the majority of Americans are satisfied with how the Bureaucracy works.
Congressmen tend to blame the bureaucracy for problems.
This is unfair because the bureaucracy cannot fight back. The Bureaucracy is Growing. In terms of the number of employees, this is not true. Until recently, the numbers were growing, but that was mostly on state and local levels. However, it is true in the sense of their budget.